Speed to Lead
Where the Five-Minute Rule Came From, and What It Really Says
Two studies, fifteen years old, merged by repetition into one imaginary study with a number neither of them contains.
Spent 8 years running operations for a startup studio that launched more than a dozen companies. Leads CRM, automation, AI assistants, websites, and delivery infrastructure at Agency Logics.
Published
Study one: Harvard Business Review, March 2011
The Short Life of Online Sales Leads, by James Oldroyd, Kristina McElheran and David Elkington. It contains two distinct pieces of research, which is itself a common source of confusion.
The audit
The authors submitted a web-generated test lead to 2,241 US companies and measured how long each took to respond. The result is the most quotable part of the paper and the part that has aged best, because it describes behaviour rather than effect:
| Response time | Share of companies |
|---|---|
| Within 1 hour | 37% |
| 1 to 24 hours | 16% |
| More than 24 hours | 24% |
| Never responded at all | 23% |
| Average, among those responding within 30 days | 42 hours |
Nearly a quarter of companies never replied to a genuine enquiry. That single number does more persuasive work than any multiplier, and it is rarely the one people quote.
The separate effect study
The article then references a second, larger analysis: 1.25 million sales leads received by 29 B2C and 13 B2B companies. Its findings, stated precisely:
- Firms contacting a prospect within an hour were nearly seven times as likely to qualify the lead as firms that tried even an hour later.
- And more than sixty times as likely as firms that waited 24 hours or longer.
- "Qualify" has a specific definition here: having a meaningful conversation with a key decision maker. Not a sale. Not an appointment. A conversation with the right person.
The 7x comparison is one hour versus two hours. It is routinely misquoted as one hour versus 24 hours, which is the 60x figure. Two different comparisons, frequently welded together.
Study two: the Lead Response Management study
Built on InsideSales.com call data with Professor Oldroyd, covering three years across six companies, more than 15,000 leads and more than 100,000 call attempts. This is the study that produced the curve everyone draws and nobody sources.
| Finding | As reported |
|---|---|
| Response decay, contact | Odds of contact drop roughly tenfold within the first hour |
| Response decay, qualification | Odds of qualifying drop more than sixfold in the same period |
| Best days | Wednesday and Thursday. Thursday 49.7% better for contact than Tuesday |
| Best window for contact | 4pm to 6pm, 114% better than 11am to 12pm |
| Best window for qualifying | 8am to 9am and 4pm to 5pm. The 8am slot 164% better than 1pm to 2pm |
| After 20 hours | Further call attempts can reduce the chance of successful contact |
The 20-hour finding deserves more attention than it gets
The study reports that attempts made beyond roughly 20 hours could be counterproductive. Taken at face value that cuts against the standard advice to keep calling, and it is the reason we treat the first day and the following weeks as two different activities rather than one long push. A lead that did not answer on day one is not best served by a fourth call on day one. It is served by a properly spaced sequence, and eventually by a reactivation campaign if the sequence ends without contact.
What the study does not license is abandoning the lead. Those are different decisions, and conflating them is exactly how the follow-up cliff forms.
Numbers to distrust
These circulate constantly in lead-generation content. None of them appear in either study in the form they are usually quoted.
| Commonly quoted | Status |
|---|---|
| "100x more likely to connect if you call in 5 minutes vs 30" | Not stated in either study as such. A restatement of the decay curve with invented precision |
| "391% more conversions responding in the first minute" | From vendor blog analyses, not from either study. Sample and method usually undisclosed |
| "78% of customers buy from the first responder" | Widely repeated, no primary source we have been able to verify. Treat as unsourced |
| "Harvard says call within 5 minutes" | Harvard Business Review published an hour-based finding. It did not publish a five-minute rule |
| "Average response time is 42 hours" | Accurate, and from the 2011 HBR audit. Worth stating it is a 2011 figure |
The conflict of interest worth naming
David Elkington, a co-author of the HBR article, was chairman and CEO of InsideSales.com when it published, and the second study runs on InsideSales.com data. InsideSales sold software that solved the problem the research identified. That does not make the findings false, and the HBR peer context is real. It does mean the research should be cited with that disclosed, which is almost never done by the agencies quoting it.
What to do with this
- Respond in minutes anyway. The evidence is directionally strong even where the precision is not, and the cost of being fast is low.
- Stop quoting multipliers you cannot source. A homeowner does not care about 391%. "A quarter of companies never reply at all" is both true and more persuasive.
- Space the follow-up rather than stacking it. The 20-hour finding suggests a fourth call in one afternoon is not the answer.
- Measure your own instead of borrowing a benchmark. How to do that in a way that produces a real number.
Common questions
- Did Harvard Business Review say to call leads within five minutes?
- No. The 2011 Harvard Business Review article by Oldroyd, McElheran and Elkington measures response within one hour, not five minutes. Its findings are that firms contacting a lead within an hour were nearly seven times more likely to qualify it than those contacting an hour later, and more than sixty times more likely than those waiting 24 hours or longer. The word five does not appear as a threshold anywhere in it.
- So where does five minutes come from?
- From the finer-grained response-decay curve in the Lead Response Management study, which analysed InsideSales.com call data across six companies, more than 15,000 leads and more than 100,000 call attempts. That study reports that the odds of making contact fall roughly tenfold within the first hour and the odds of qualifying fall more than sixfold. Five minutes became the marketing shorthand for the steepest part of that curve.
- Is the five-minute rule wrong then?
- The direction is right and the precision is invented. Responding in minutes genuinely beats responding in hours, and both studies support that. What is not supported is treating five minutes as a validated cliff edge, or quoting figures like 100x and 391% that appear in neither study as stated.
- What is the finding nobody quotes?
- That persistence has a limit within a single push. The Lead Response Management study found that call attempts made after roughly 20 hours could actually reduce the chance of successful contact. That is the opposite of the advice to keep dialling indefinitely, and it points at spacing attempts properly rather than stacking them.
- Do these studies apply to home services in 2026?
- Not directly. Both examine web-generated leads from roughly 2007 to 2011 in brokered verticals like insurance, lending and automotive, contacted mainly by phone. A homeowner requesting a roof estimate today, who expects a text back, is a different behaviour in a different market. The mechanism almost certainly still holds. The specific multipliers should not be quoted as if they were measured in your industry this year.
Sources
- 1.Oldroyd, McElheran and Elkington, The Short Life of Online Sales Leads, Harvard Business Review, March 2011 The 2,241-company audit, the 42-hour average, and the 7x and 60x qualification findings.
- 2.The Lead Response Management Study The response-decay curve, day and time-of-day findings, and the 20-hour result.
Being right about this is worth more than being fast about it
Most businesses are neither. If you want a straight read on where your own response time and follow-up actually sit, both are measurable from data you already hold.
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