ZodiemSpeed to lead is the time between a buyer asking for contact and someone, or something, responding. The research on it is old, narrow and often misquoted. This guide sets out what the studies measured, what they did not, and what a team can sensibly conclude.
The two studies everyone cites
The MIT and InsideSales.com study (2007). Dr. James Oldroyd of MIT Sloan worked with InsideSales.com on three years of data from six companies: more than 15,000 leads and 100,000 call attempts. It reported that the odds of contacting a lead called within 5 minutes, compared with 30 minutes, were about 100 times higher, and the odds of qualifying it about 21 times higher. These are odds ratios from one dataset. The study did not address close rates, and the data predates the smartphone era.
The Harvard Business Review study (2011). Oldroyd, McElheran and Elkington audited 2,241 US companies by submitting test web leads. Separately they analysed 1.25 million leads from 29 B2C and 13 B2B companies. Firms that contacted a lead within an hour were nearly seven times as likely to qualify it as firms that tried even an hour later, and more than 60 times as likely as firms that waited 24 hours or more.
Source: Harvard Business Review, 2011. The reported average of 42 hours excludes the 23% who never replied.
Two corrections are worth making. The 100x and 21x figures are often credited to Harvard, but they come from the MIT study. And the HBR paper measured response in hours, so it does not contain a "five-minute rule" at all.
What the studies do not tell you
- They do not say a faster reply causes a sale. Teams that reply quickly may also be better at everything else.
- They measure phone contact in an earlier era. Today a buyer may never pick up.
- They are about web leads in general, not about B2B demo requests for software specifically.
Read them as strong evidence that delay costs you, and weak evidence about the exact size of the cost.
Why buyers make delay worse
6sense's 2024 Buyer Experience Report found buyers nearly 70% through their purchase process before they engage a seller, starting first contact more than 80% of the time, and 81% already holding a preferred vendor at that moment. A buyer who reaches out has usually done their reading and is ready to talk. Making them wait for a calendar slot spends that readiness. The release did not state a sample size, so treat the figures as indicative.
What a team can do about it
- Measure your own number first. Time from form fill to first human reply, as a median, not a mean.
- Stop treating the form as the product. Let visitors act while they are on the page: book a time instantly, or talk to a live agent.
- Set a response target you can meet at 2am. A target that needs a person awake is not a target.
- Route the hot ones. Fast and wrong is worse than a little slower and right, so use signals such as questions asked to decide who a person calls first.
A live demo agent is one way to meet the target, because the response happens during the visit instead of after it. It is not the only way, and it does not fix a slow follow-up process after the call. See the calculator to size the gap for your own funnel.