Does replying fast really win customers?
The best-known studies are old and come from US sales leads. Firms that tried to reach a web enquiry within an hour were far more likely to have a real conversation with the customer than firms that waited, and nearly a quarter of firms never replied at all. The popular “5-minute rule” comes from a vendor study of six firms’ phone calls that never measured sales. No peer-reviewed study yet links reply speed to sales for local businesses on WhatsApp, which is why we publish our own figures.
What to do
- Answer every new enquiry within minutes, and never leave one overnight without a reply.
- Let an instant first reply handle routine questions like price, hours and booking, and hand anything unusual to a person.
- Track two numbers: your median first-reply time and the share of conversations you answer.
What the research says
- Independent researchOlder study
The Short Life of Online Sales Leads
Oldroyd, McElheran & Elkington, HBR 2011
Firms that tried to contact a web lead within an hour were nearly 7× as likely to qualify it as firms that waited even one more hour, and more than 60× as likely as firms that waited 24 hours or more. In an audit of 2,241 US firms, 23% never responded and the average response time was 42 hours.
What it means for you: Treat every enquiry as perishable: answer within minutes, and never leave one overnight.
Keep in mind: US sales leads from before 2011, not local shops. Fast responders may differ in other ways, and a co-author ran a lead-response software company.
Read the sourceMethod and quote
Two parts. (1) A mystery-shopper audit that sent test web leads to 2,241 US companies. (2) An observational analysis of 1.25 million sales leads at 29 B2C and 13 B2B US companies. Data collected before early 2011. Correlational, not causal.
“Firms that tried to contact potential customers within an hour of receiving a query were nearly seven times as likely to qualify the lead (which we defined as having a meaningful conversation with a key decision maker) as those that tried to contact the customer even an hour later—and more than 60 times as likely as companies that waited 24 hours or longer.”
- Vendor researchOlder study
Lead Response Management Study
InsideSales.com/MIT, 2007
Calling a web lead within 5 minutes rather than 30 minutes was associated with 100× higher odds of contact and 21× higher odds of qualifying the lead.
What it means for you: A directional “minutes matter” signal. It measured phone contact and qualification, never sales.
Keep in mind: Vendor study of six firms’ phone calls (2007), not peer-reviewed. The source of the popular “5-minute rule”.
Read the sourceMethod and quote
"3 years of data across six companies that generate and response to web leads, from over fifteen thousand leads and over one hundred thousand call attempts." Telephone follow-up only. Observational.
“The odds of contacting a lead if called in 5 minutes versus 30 minutes drop 100 times. The odds of qualifying a lead if called in 5 minutes versus 30 minutes drop 21 times.”
- Vendor research
Airline customer-care study
Twitter Insights & Applied Marketing Science, 2015
Customers whose tweet an airline answered in under 6 minutes were willing to pay almost $20 more for that airline in future. When the reply took more than an hour, the figure was $2.33.
What it means for you: A fast reply to a complaint is also a sales tool: customers value the business more afterwards.
Keep in mind: Vendor research on US airlines. Stated willingness to pay, not actual spending.
Read the sourceMethod and quote
More than 600,000 customer-service tweets to major US airlines (Mar–Sep 2015), split by whether the airline replied. Users then completed conjoint (simulated-choice) exercises. This is stated willingness to pay, not observed spending.
“We found that when an airline responded to a customer's Tweet in less than 6 minutes, the customer was willing to pay almost $20 more for that airline in the future. By contrast, when the airline took longer than an hour to respond to the Tweet, the customer was willing to pay only $2.33 more…”
What cuts the other way
Research that complicates the picture, and what to take from it.
- Peer-reviewed or official
Opposing Effects of Response Time in Human–Chatbot Interaction
Gnewuch, Morana, Adam & Maedche, BISE 2022
A delayed chatbot reply had opposing effects on perceived social presence and on usage intentions. The effect depended on whether users had used a chatbot before.
What it means for you: Instant isn’t automatically best for a bot; a natural pause can feel more human to newcomers.
Keep in mind: A lab experiment with 202 people.
Read the sourceMethod and quote
Lab experiment, N = 202.
“In a lab experiment (N = 202), participants interacted with a chatbot that responded either instantly or with a delay. The results reveal that a delayed response time has opposing effects on social presence and usage intentions…”
Sources checked as of October 25, 2026. Links go to the original publication.