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Speed to lead: what the research really says, and which statistics are made up
Responding fast to a new enquiry matters. But most of the numbers used to prove it are misquoted, and one of the most famous was never a study at all. Here is what the evidence supports.
By the Unibound team6 min read
Speed to lead is one of the few ideas in sales that almost everyone accepts. It is also supported, in most articles, by a handful of statistics that have been copied from blog to blog for fifteen years, gaining precision and losing their sources along the way.
We went back to the originals. Some of the famous numbers hold up, with caveats. Some have been stretched. One is fiction. This is the audit, followed by what it means in practice.
The study behind the five-minute rule
The claim that you must respond within five minutes comes from the Lead Response Management Study, presented in October 2007 by Dave Elkington of InsideSales.com and James Oldroyd, then a faculty fellow at MIT.
They analysed three years of data from six companies: about 15,000 leads and 100,000 call attempts. The findings:
- The odds of contacting a lead fell 100 times between a call at five minutes and one at thirty.
- The odds of qualifying a lead fell 21 times over the same interval.
- Even from five minutes to ten, contact odds fell five times.
- After 20 hours, each additional dial reduced the chance of making contact.
What gets lost in the retelling:
- It is not an MIT or Harvard study. It was run by a vendor on its customers' data, with an academic collaborator.
- It did not measure sales. In its own words, "This study did not address close ratios." Any version that says you are 21 times more likely to close is a misquote.
- It is small and old. Six companies, web leads followed up by phone, between 2004 and 2007.
- Its authors were candid about its limits. Asked later whether instant response applies to low-intent leads such as white-paper downloads, InsideSales's Ken Krogue wrote: "Honest answer? We don't know."
The Harvard Business Review study
The stronger source is The Short Life of Online Sales Leads, published in Harvard Business Review in March 2011 by Oldroyd, Kristina McElheran and Elkington. It had two parts.
First, an audit of 2,241 US companies, measuring how long each took to respond to a web enquiry:
The average first response, among those that responded at all, was 42 hours.
Second, an analysis of 1.25 million leads at 42 companies. Firms that tried to contact a lead within an hour were nearly seven times as likely to qualify it as those that tried an hour later, and more than sixty times as likely as those that waited a day or more.
This is a short magazine article, not a peer-reviewed paper, and "qualify" means having a meaningful conversation with a decision-maker, not winning the sale. It is also American and fifteen years old. But the sample is large and the direction is unambiguous: the first hour matters most.
The statistics with nothing behind them
| Claim | What we found | Verdict |
|---|---|---|
| "78% of customers buy from the first company to respond" | Credited to a "Lead Connect" survey that doesn't exist. The earliest trace is a 2008 Leads360 white paper: "in some industries, 78% of buyers close with the company that contacted them first". No sample, no method | No evidence |
| "391% more conversions if you call in the first minute" | A Velocify press release, from its own unpublished customer data. The comparison was one minute against any later time; no base rates given | Vendor claim. Attribute it if you use it |
| "21 times more likely to close" | The 2007 study said qualify, and explicitly did not study closing | Misquote |
| "The average response time is 42 hours" | True of US companies in the 2011 audit. Often presented as current, or credited to the wrong study | Real, but dated |
| "It takes 8 attempts to reach a prospect" | Repeated widely. No primary source found | No evidence |
The "78%" figure is worth dwelling on because it does the most work in sales decks. It may even be roughly true in some markets. But nobody has measured it, and a claim you can't source is a claim your prospect's finance director can dismiss.
How fast companies actually respond
If the evidence for speed were weak, you might expect slow responders to be rare by now. They are not. Three secret-shopper tests, all by software vendors but with clear methods:
| Test | Sample | Finding |
|---|---|---|
| Drift, 2017 | 433 B2B software companies | 7% responded within five minutes; 55% had not responded after five working days |
| RevenueHero, 2024 | 1,000 B2B software companies | 63.5% never responded to a demo request; the rest averaged 1 day 5 hours |
| Workato, 2026 | 114 B2B companies | Only one sent a personal email within five minutes; none phoned within five minutes; 31% phoned at all |
These are American and B2B. We know of no equivalent published test of UK firms, in home services, property or legal work for example, which is a gap someone should fill. The quickest way to find out where you stand is to test yourself, as described below.
So the opportunity is real. In most markets, simply being the firm that responds in the first few minutes puts you ahead of nearly everyone.
What speed can't do
In May 2026 Intercom argued that speed to lead is "a solved problem", since software can now respond instantly. That is half right. Responding is solved. Three things aren't.
- Getting the call answered. Half of UK mobile users say they are unlikely to pick up a number they don't recognise, according to Ofcom. A fast call that rings out has achieved nothing unless something follows it.
- The quality of the first conversation. An instant, generic auto-reply is not a response. The studies measured real contact: a conversation that moved things forward.
- Intent. Speed helps most with people who have asked for a quote, a call or a demo. Nobody has shown it helps with someone who downloaded a guide, and calling them within nine seconds may simply be alarming.
There is also the law. In the UK you can't ring at any hour, marketing calls must respect the Telephone Preference Service, and automated marketing calls need specific consent. See the UK rules for AI calls and texts.
What to do with this
- Measure your own number first. Send an enquiry through your own form at 8pm on a Thursday and time the first real response. Then do it on a Sunday.
- Respond in seconds to high-intent enquiries, by phone where you may, because a conversation qualifies faster than a form.
- Plan for no answer. Follow a missed call with a text or WhatsApp straight away, then a second call the next morning. This is where a branching flow beats a fixed sequence.
- Make the first contact useful. Ask the questions a good salesperson would, answer theirs, and offer a time.
- Pass the right ones to a person quickly. Speed to a human matters too, once the customer is ready for one.
- Stop when they say no. Persistence has a limit: in the 2007 data, extra dials after 20 hours made contact less likely.
The step-by-step version is in the AI lead follow-up playbook, and the product page is speed to lead with Unibound.
How to cite this honestly
If you need a line for a board paper, these are defensible:
- "In a 2011 Harvard Business Review study of 1.25 million leads, companies that tried to make contact within an hour were nearly seven times as likely to qualify the lead as those that waited an hour longer."
- "In a 2007 analysis of six companies, the odds of reaching a lead fell 100-fold between five and thirty minutes."
- "In a 2024 test of 1,000 B2B software companies, 63.5% never replied to a demo request."
And leave the 78% out.
Questions people ask
What is speed to lead?
Speed to lead is the time between someone making an enquiry and your first real attempt to speak to them. It is also called lead response time. The idea is that interest fades quickly, so the sooner you respond, the more likely you are to reach and qualify them.
What is a good lead response time?
Under five minutes is the usual target for an inbound enquiry, and within seconds is now achievable with automation. The research supports responding within the hour at the very least: the 2011 Harvard Business Review study found a steep drop in qualification after the first hour.
Where does the five-minute rule come from?
From the Lead Response Management Study presented in 2007 by InsideSales.com with James Oldroyd, then a fellow at MIT. It analysed about 15,000 leads and 100,000 call attempts at six companies and found the odds of contacting a lead fell 100 times between five and thirty minutes.
Is it true that 78% of customers buy from the first responder?
There is no evidence for it. The figure is usually credited to a Lead Connect survey that does not exist. The earliest version found is a 2008 vendor white paper saying that in some industries 78% of buyers close with the first company to contact them, with no data given.
Does responding faster actually increase sales?
The best studies measured contact and qualification, not sales, so the direct effect on revenue is less proven than usually claimed. It is reasonable to expect more conversations to produce more sales, but speed will not rescue a poor first conversation or a lead with no real intent.
Sources
- InsideSales.com and Oldroyd, Lead Response Management Study (2007). mortech.com
- Oldroyd, McElheran and Elkington, The Short Life of Online Sales Leads (Harvard Business Review, March 2011). hbr.org
- Krogue, Beyond the LRM Study (InsideSales, 2009). insidesales.com
- Drift, Lead Response Survey (2017, now hosted by Salesloft). salesloft.com
- RevenueHero, B2B lead response times (March 2024). revenuehero.io
- Workato, lead response time study (March 2026). workato.com
- Velocify, press release on time of day and speed of follow-up (May 2016). prnewswire.com
- Ofcom, experiences of suspicious calls, texts and app messages (2024). ofcom.org.uk
