The most-cited statistic in B2B sales
The Oldroyd HBR study from 2011 is the most-quoted research in sales-ops literature. The finding sounds extreme: firms that respond within one hour are nearly 7 times more likely to qualify a lead than firms that wait longer. The earlier MIT/InsideSales work pushed the threshold further: firms that respond within 5 minutes are 21 times more likely to qualify than those that wait 30 minutes.
Most teams hear this stat and nod along. Then they check their own response times and discover the median first reply is 18 hours, not 5 minutes. The gap between what teams know is true and what teams actually do is where the revenue leaks out.
Why the curve is so steep
Customer intent is highest at the moment of message arrival. The customer made a decision to fill out the form, send the WhatsApp, or pick up the phone. At minute 1 they are in buying mode. At minute 60 they have moved on to a competitor or another task. At hour 24 they have forgotten they ever enquired. Replying inside the first 5 minutes catches the customer still in the decision they just made.
What this calculator quantifies
Multiply your monthly leads by your close rate by the qualification multiplier for your current response bucket. Compare against the 1.0 baseline (under 5 min). The gap, in £, is what you leave on the table every month by not responding faster. Most UK SMB operators are surprised when they run their own numbers; the typical answer is 30-60% of revenue lost to slow response.
The realistic fix
You don't have to staff WhatsApp 24/7. The fastest path to under-5-min median response is: WhatsApp as the primary inbound channel (open rate beats email), plus an AI auto-reply that handles the first response in under 60 seconds, plus a human team member to take over once the customer is engaged. That pattern is what NuvenarHub Agent is built for.