This briefing assembles the verified evidence behind “speed to lead”: how the time between a lead’s inquiry and a company’s first contact attempt affects the odds of reaching, qualifying, and converting that lead. The foundational figures come from two studies (Oldroyd/MIT-InsideSales 2007 and Harvard Business Review 2011) that are now more than a decade old and heavily re-quoted, so this asset flags their age explicitly and pairs them with newer audits from 2016 to 2024 that test whether company behavior has actually changed. The short answer: the math favoring fast response is well documented, and most companies still respond slowly.

For a research-led view of how this maps to pipeline and revenue operations, see CO Consulting.

Executive Summary

• Contacting a web lead within 5 minutes versus 30 minutes raised the odds of reaching that lead by about 100 times and the odds of qualifying it by about 21 times (US behavioral data, 2007; Oldroyd, MIT/InsideSales.com). Source
• Firms that attempted contact within an hour of a query were nearly 7 times more likely to qualify the lead than those waiting just one hour longer, and more than 60 times more likely than those waiting 24+ hours (US, 2011; Harvard Business Review, 2,241 companies). Source
• The average first-response time in the HBR audit was 42 hours, and 23% of the 2,241 US companies never responded at all (2011; Harvard Business Review). Source
• In a 2024 audit of 1,000 B2B SaaS companies, 63.5% never responded to a demo request, and those that did averaged 1 day, 5 hours, 17 minutes (RevenueHero, 2024). Source
• In a separate 2024 test of 114 B2B companies, more than 99% failed to respond within 5 minutes and not one placed a phone call inside that window (Workato, 2024). Source
• Only 7% of 433 tested companies responded within 5 minutes, and 55% had not responded within five business days (US, 2017; Drift). Source
• Across roughly 3.5 million leads from 400+ companies, calling within one minute of lead creation increased conversion by 391%, and 93% of leads that ultimately converted were reached within 6 call attempts (Velocify, c.2013). Source
• The famous 5-minute and 7x figures predate today’s market: prefer them as directional thresholds, and treat the newer 2016-2024 audits as the current read on actual company behavior.

Key Findings

• The odds of contacting a web lead dropped about 100 times when the first call moved from 5 minutes to 30 minutes after the inquiry (US behavioral data, 3 years, 2007; Oldroyd, MIT/InsideSales.com). Source
• The odds of qualifying a lead dropped about 21 times when the first call moved from 5 minutes to 30 minutes (US, 2007; Oldroyd, MIT/InsideSales.com). Source
• The odds of qualifying a lead fell roughly 4 times just from waiting 5 to 10 minutes (US, 2007; Oldroyd, MIT/InsideSales.com). Source
• In the HBR audit, 37% of US companies responded within one hour, 16% within one to 24 hours, 24% took more than 24 hours, and 23% never responded (2011; Harvard Business Review). Source
• Companies contacting a lead within one hour were nearly 7 times more likely to qualify it than those waiting one hour longer (US, 2011; Harvard Business Review). Source
• The average first-response time across 2,241 audited US companies was 42 hours (2011; Harvard Business Review). Source
• In 2024, 63.5% of 1,000 B2B SaaS firms never replied to a submitted demo request (RevenueHero, 2024). Source
• Among the 36.5% of firms that did reply in that 2024 test, the average response time was 1 day, 5 hours, 17 minutes (RevenueHero, 2024). Source
• In the 2024 Workato audit of 114 companies, average email response was 11 hours 54 minutes and average phone callback was 14 hours 29 minutes (Workato, 2024). Source
• In that same audit, only 31% of companies ever called back, and companies using lead-routing tools averaged 3 hours 32 minutes versus roughly 13 hours without them (Workato, 2024). Source
• Wednesdays and Thursdays were the best days to make contact, improving contact rates by 49.7% over the worst day (US, 2007; Oldroyd, MIT/InsideSales.com). Source
• The 4 to 6 pm block was the best time to make contact, 114% better than the worst time block (US, 2007; Oldroyd, MIT/InsideSales.com). Source
• The 8 to 9 am and 4 to 5 pm windows were best for qualifying leads, 164% better than the 1 to 2 pm post-lunch block (US, 2007; Oldroyd, MIT/InsideSales.com). Source
• Calling a lead within one minute of creation lifted conversion by 391% across roughly 3.5 million leads (Velocify, c.2013). Source
• 93% of leads that converted were reached within 6 call attempts, marking the point of sharply diminishing returns (Velocify, c.2013). Source

The Foundational Studies and Why Their Age Matters

Two studies anchor nearly every “speed to lead” claim in circulation. Both are old, both are heavily paraphrased, and both deserve careful attribution.

The first is the 2007 Lead Response Management work led by Dr. James B. Oldroyd, then a faculty fellow at MIT, in partnership with InsideSales.com. It had two parts: a Kellogg survey of 495 companies driving web leads (June to September 2007), and a behavioral analysis of 3 years of data across 6 companies covering over 15,000 leads and over 100,000 call attempts. Source: Oldroyd, MIT/InsideSales.com, 2007, PDF. This is where the 100x contact and 21x qualify figures (5 vs 30 minutes) originate. The “5-minute rule” is a popularization of this finding; the study itself frames it as a comparison of 5-minute versus 30-minute first contact, not a hard 5-minute deadline.

The second is the Harvard Business Review article “The Short Life of Online Sales Leads” (March 2011), by James Oldroyd, Kristina McElheran, and David Elkington, which audited 2,241 US companies. Source: Harvard Business Review, 2011, article. This is the source of the 42-hour average, the 37/16/24/23 percent response distribution, and the 7x-within-one-hour qualification figure.

Limitation to state plainly: these are 2007 and 2011 datasets. Buyer channels (chat, SMS, self-serve scheduling), CRM automation, and competitive norms have shifted since. The relationships they document (faster contact improves contact and qualification odds) are corroborated by later work, but the exact multipliers should be read as directional, not as current measured constants. Where possible this asset pairs them with 2016-2024 audits below.

What Newer Audits Show About Actual Company Behavior

The more useful question for 2026 is not whether speed helps in theory, but whether companies have gotten faster. Multiple independent mystery-shopper audits say no.

RevenueHero submitted demo requests to 1,000 B2B SaaS companies in 2024; 635 (63.5%) never responded, and the 365 that did averaged 1 day, 5 hours, 17 minutes to first reply, with 172 responding near-instantly (under about 2 minutes). Source: RevenueHero, 2024, study.

Workato filled out demo forms at 114 B2B companies in 2024; more than 99% failed to respond within 5 minutes, no company placed a call within 5 minutes, average email response was 11 hours 54 minutes, and average phone callback was 14 hours 29 minutes. Companies with lead-routing tools averaged 3 hours 32 minutes versus roughly 13 hours without. Source: Workato, 2024, study.

Drift’s earlier survey of 433 B2B companies (2017) found only 7% responded within 5 minutes and 55% had not responded within five business days. Source: Drift, 2017, summarized in study compilation. An InsideSales ResponseAudit of 4,723 leads (2016) found 77.17% of leads never received a response and an average first-response time of 44 hours. Source: InsideSales.com ResponseAudit, 2016, infographic.

What it means: across four audits spanning 2016 to 2024 and different methodologies and samples, the consistent finding is that a majority of companies respond slowly or not at all. The gap between documented best practice and observed behavior has not closed.

Follow-Up Persistence

Speed gets the first touch; persistence gets the contact. Velocify’s analysis of roughly 3.5 million leads across 400+ companies found that 93% of leads that eventually converted were reached within 6 call attempts, identifying about 6 as the optimal effort ceiling before sharp diminishing returns. Source: Velocify, “The Ultimate Contact Strategy,” c.2013, study. The same analysis attributed a 391% conversion lift to calling within the first minute of lead creation.

Caution: a widely circulated claim that “80% of sales require 5 follow-ups” is commonly attributed to a “National Sales Executive Association” that has no verifiable record. This asset excludes that figure as unsourced and relies on the Velocify call-attempt data instead.

Original Synthesis

1. The response-time decay curve, restated as thresholds. Combining the MIT/InsideSales 5-vs-30-minute drops (100x contact, 21x qualify) with the 5-vs-10-minute drop (about 4x qualify) shows the steepest loss happens inside the first 10 minutes, not across the first hour. Logic: the published multipliers are largest for the smallest time deltas early on. Inputs: Oldroyd, MIT/InsideSales.com, 2007. Limitation: these are odds ratios from 2007 behavioral data on 6 companies, not modern conversion rates, and should not be multiplied against today’s pipeline values as if they were current constants.

2. The practice-versus-evidence gap index. Best-practice evidence points to sub-5-minute contact, yet the 2024 audits show 99%+ (Workato) and roughly 99.8% by-instant-call (RevenueHero, where only 172 of 1,000 even replied near-instantly and via automation) miss it. Logic: compare the recommended threshold (5 minutes) against the share of audited firms meeting it. Inputs: Workato 2024; RevenueHero 2024; Drift 2017. Limitation: each audit uses different samples, industries, and definitions of “response” (automated vs human), so the figures are directionally aligned, not strictly comparable.

3. Stability of the slow-response problem over time. Across 2011 (HBR: 23% never responded, 42-hour average), 2016 (InsideSales: 77.17% never responded, 44-hour average), and 2024 (RevenueHero: 63.5% never responded, ~29-hour average), the non-response share has stayed high and the average response time has stayed in the tens of hours for more than a decade. Logic: line up the comparable “never responded” and “average response” metrics by year. Inputs: HBR 2011; InsideSales 2016; RevenueHero 2024. Limitation: samples and lead types differ (B2B web leads vs B2B SaaS demo requests), so the trend is qualitative, not a controlled time series.

Response-Time Distribution: HBR 2011 Audit

Source: Harvard Business Review, “The Short Life of Online Sales Leads,” 2011, 2,241 US companies. Link

Mystery-Shopper Audits Compared

Sources: HBR 2011; InsideSales 2016; Drift 2017; Workato 2024; RevenueHero 2024. Samples and definitions differ, so figures are not strictly comparable. Links in Key Findings and section text.

MIT/InsideSales Odds Multipliers (2007)

Source: Oldroyd, MIT/InsideSales.com Lead Response Management Study, 2007 (behavioral data across 6 companies, 15,000+ leads, 100,000+ call attempts). Link

Charts to Build

• Qualification odds vs response delay (5/10/30 min). Data: MIT/InsideSales 2007 multipliers (4x at 10 min, 21x at 30 min). Source: Oldroyd 2007. Insight: the curve falls fastest inside 10 minutes. Citation-worthy because it visualizes the single most-quoted speed-to-lead claim with its real source.
• Company response distribution (HBR 2011). Data: 37/16/24/23 percent buckets. Source: HBR 2011. Insight: nearly a quarter of companies never respond. Citation-worthy as the canonical benchmark of company behavior.
• Non-response rate over time (2011/2016/2024). Data: 23%, 77.17%, 63.5%. Sources: HBR, InsideSales, RevenueHero. Insight: the problem has persisted for over a decade. Citation-worthy as an original longitudinal framing.
• Routing tools vs no tools (Workato 2024). Data: 3h 32m vs ~13h. Source: Workato 2024. Insight: tooling roughly quartered response time. Citation-worthy for the operational takeaway.
• Cumulative conversions by call attempt. Data: 93% reached within 6 attempts. Source: Velocify c.2013. Insight: persistence pays up to about 6 calls. Citation-worthy for follow-up cadence design.

Methodology

Source-selection criteria: priority to the original studies (Oldroyd/MIT-InsideSales 2007; HBR 2011) and to first-party mystery-shopper audits that publish sample size and method (RevenueHero 2024, Workato 2024, Drift 2017, InsideSales 2016, Velocify c.2013). Secondary aggregators were used only to locate and cross-check primary figures, never as the sole source for a number.

Inclusion rule: a statistic is included only if a sample size, year, and geography or scope could be attached and the figure could be traced to the originating study. Exclusion rule: figures with no traceable origin were dropped. Two commonly repeated claims were excluded for this reason: “80% of sales require 5 follow-ups” (attributed to a National Sales Executive Association with no verifiable record) and “78% of customers buy from the company that responds first” (no consistently traceable primary source). The “35% to 50% of sales go to the first responder” claim is noted only as widely cited with weak primary attribution and is not presented as a verified statistic.

Handling conflicts: where audits disagree (for example, non-response rates of 23%, 77.17%, and 63.5%), each is reported with its own sample and year rather than averaged, because methods and lead types differ. Derived insights in Original Synthesis are labeled as derived and carry stated limitations. No multipliers were combined into compound conversion claims.

Data limitations: the two foundational studies are from 2007 and 2011 and are widely re-quoted; they are flagged as dated and used as directional thresholds. Last updated: June 2026.

Source Quality

Tier 1 (primary research and academic-affiliated): Harvard Business Review, “The Short Life of Online Sales Leads,” 2011; Oldroyd (MIT)/InsideSales.com Lead Response Management Study, 2007.

Tier 2 (first-party industry audits and vendor research with disclosed method): RevenueHero 2024; Workato 2024; Drift 2017; InsideSales.com ResponseAudit 2016; Velocify “Ultimate Contact Strategy” c.2013.

Tier 3 (reputable compilations used for cross-checking only): AInora study compilation 2026.

Most Quotable Statistics

• “Contacting a lead within 5 minutes versus 30 minutes raised the odds of reaching it by about 100 times.” (Oldroyd, MIT/InsideSales.com, 2007)
• “The average company in HBR’s 2,241-firm audit took 42 hours to respond, and 23% never responded at all.” (Harvard Business Review, 2011)
• “In 2024, 63.5% of 1,000 B2B SaaS companies never replied to a demo request.” (RevenueHero, 2024)
• “More than 99% of 114 audited companies failed to respond within 5 minutes; none called within that window.” (Workato, 2024)
• “93% of leads that converted were reached within 6 call attempts.” (Velocify, c.2013)

Data Limitations

• The 5-minute, 100x, 21x, 7x, and 42-hour figures come from 2007 and 2011 studies and are repeated far beyond their original context; treat them as directional thresholds, not current measured constants.
• Audit samples differ in size, industry, geography, and what counts as a “response” (automated vs human), so cross-study comparisons are qualitative.
• Vendor-published audits may carry incentive bias toward emphasizing slow response; they are placed in Tier 2 and reported with their disclosed methods.
• Several popular speed-to-lead stats were excluded for lacking a traceable primary source.

Recommended Dataset Fields

• study_name
• publisher
• publication_year
• sample_size
• geography_scope
• metric_name
• metric_value
• metric_unit
• response_channel (email/phone/chat)
• source_url
• tier (1/2/3)
• verification_status

Press Summary

The case for fast lead response rests on two studies that are now over a decade old. A 2007 MIT/InsideSales analysis found that contacting a web lead within 5 minutes rather than 30 raised the odds of reaching it roughly 100-fold and qualifying it roughly 21-fold. Harvard Business Review’s 2011 audit of 2,241 US companies found an average first-response time of 42 hours and 23% that never responded. Those figures are widely re-quoted and should be read as directional given their age. What newer audits add is that company behavior has barely improved: in 2024, RevenueHero found 63.5% of 1,000 B2B SaaS firms never replied to a demo request, and Workato found more than 99% of 114 firms missed the 5-minute mark. Velocify’s analysis of about 3.5 million leads adds the follow-up dimension, showing 93% of converting leads were reached within 6 call attempts. The evidence is consistent: speed and persistence help, and most companies still do neither well.

Suggested Headlines

• The 5-Minute Rule Is 15 Years Old. Here Is What the Newer Data Actually Says.
• 63.5% of B2B SaaS Companies Never Reply to a Demo Request, 2024 Audit Finds
• Speed to Lead, Verified: Every Major Study From MIT 2007 to RevenueHero 2024
• Why a 42-Hour Average Response Time Still Defines Most Sales Teams
• Fast and Persistent: The Two Numbers That Predict Whether a Lead Converts

FAQ

What is speed to lead? Speed to lead is the elapsed time between a prospect’s inbound inquiry and the company’s first contact attempt; the 2007 MIT/InsideSales study found contacting within 5 versus 30 minutes raised contact odds about 100 times. (Oldroyd, MIT/InsideSales.com, 2007)

Where does the 5-minute rule come from? It is a popularization of the 2007 MIT/InsideSales finding that the odds of qualifying a lead dropped about 21 times when first contact moved from 5 to 30 minutes. (Oldroyd, MIT/InsideSales.com, 2007)

Is the famous Harvard study current? No; it was published in March 2011 and audited 2,241 US companies, so its 42-hour-average and 7x figures should be treated as directional today. (Harvard Business Review, 2011)

How much more likely are you to qualify a lead by responding within an hour? Nearly 7 times more likely than waiting one hour longer, and more than 60 times more likely than waiting 24+ hours. (Harvard Business Review, 2011)

What is the average company response time? HBR’s 2011 audit measured 42 hours; a 2024 RevenueHero audit of responding firms measured 1 day, 5 hours, 17 minutes. (HBR 2011; RevenueHero 2024)

How many companies never respond at all? 23% in HBR’s 2011 audit and 63.5% in RevenueHero’s 2024 audit of B2B SaaS firms. (HBR 2011; RevenueHero 2024)

Have companies gotten faster since 2011? Not meaningfully; a 2024 Workato audit found more than 99% of 114 firms failed to respond within 5 minutes. (Workato, 2024)

Does lead-routing software help? Yes; in Workato’s 2024 audit, firms using routing tools averaged 3 hours 32 minutes versus roughly 13 hours without. (Workato, 2024)

How many follow-up attempts are optimal? Velocify’s analysis found 93% of converting leads were reached within 6 call attempts. (Velocify, c.2013)

What is the best time of day to call? The 2007 study found 4 to 6 pm best for making contact and 8 to 9 am and 4 to 5 pm best for qualifying, with Wednesday and Thursday the best days. (Oldroyd, MIT/InsideSales.com, 2007)

For teams that want this evidence translated into a response-time SLA and routing model, CO Consulting offers a consultation.