The booking usually goes to whoever replies first

The short answer: A customer enquiring on WhatsApp is usually messaging two or three businesses at once. Whoever gives a useful reply first has a strong chance of getting the booking, and the chance drops fast with every hour of silence. Research published in Harvard Business Review in 2011 found that firms contacting a lead within an hour were about seven times more likely to qualify it than those who waited even one more hour, and the average firm took far longer than that. Aim to reply to new enquiries within five minutes, and make sure that reply contains something useful: a price, an available slot, or a clear next step. If you can't staff that, automate the first reply.

I used to assume businesses lost customers on price. Then I started sitting with owners and scrolling through their WhatsApp. The lost ones mostly weren't lost on price. They were enquiries that got a reply at 10am the next day, after the customer had already booked somewhere else at 9:30pm the night before.

What the research says

The best-known work on this is a study by James Oldroyd, Kristina McElheran and David Elkington, published in Harvard Business Review as "The Short Life of Online Sales Leads" (March 2011). They audited over 2,000 US companies and found:

Firms that tried to contact a lead within an hour were nearly seven times more likely to qualify it than firms that waited two hours, and more than 60 times more likely than firms that waited a day or longer.
The average response time was about 42 hours.
Nearly a quarter of companies never responded at all.

Earlier work by Oldroyd with InsideSales found the drop-off starts within minutes, not hours: leads contacted within five minutes were far more likely to be reached and qualified than those contacted at thirty.

Those studies looked at web forms and phone calls, not WhatsApp. If anything, WhatsApp makes it sharper. Messaging three businesses takes the customer thirty seconds, so comparing you with competitors is effortless.

A fast reply has to be a useful reply

"Thanks for your message, we'll get back to you soon" is technically quick. It does nothing. The customer's question hasn't been answered and they're still waiting.

A good first reply does at least one of these:

The customer asked	A useful fast reply
"How much?"	The price, or the range, and what it depends on
"Are you free Saturday?"	The actual Saturday slots, and how to book one
"Do you do X?"	Yes or no, what it includes, and the next step
Something complicated	What you need from them to answer it, and when a person will follow up

Getting under five minutes without hiring

For most SMEs, replying within five minutes around the clock isn't possible with people alone. It is possible with a mix.

Automate the first answer, not the whole relationship. An AI assistant trained on your prices, services and availability can answer most first questions accurately and pass everything else to your team with the context attached. We cover what that looks like in what an AI WhatsApp assistant actually does.

Spot the urgent ones. Messages saying "today", "ASAP", "urgent" or naming a date this week are more likely to book, and more likely to book elsewhere if you're slow. Put them at the top.

Put every channel in one place. If enquiries come in on WhatsApp, Instagram and Facebook, and each is checked by a different person at a different time, your real response time is the slowest of the three. See the multi-location inbox problem.

Promise only what you can keep. If a person replies within fifteen minutes during opening hours, say that. A reliable fifteen minutes beats a promise of "instant" that turns into two hours.

Watch out

Speed doesn't rescue a bad answer. An automated reply that gets the price wrong or offers a slot you don't have does more damage than a slow correct one. Automate only what you can answer correctly every time.

A rough sense of the money

Say you miss two enquiries a week that would have booked a $150 service. That's about $300 a week, or more than $15,000 a year. You don't need to believe any particular study to check this. Look at your own enquiries from last month that went quiet after your first reply, and see how long that first reply took.

Common questions

How fast should a business reply on WhatsApp?

For a new enquiry, within five minutes if you can. Response rates and conversion fall sharply within the first hour, according to research on lead response times.

Does replying outside office hours really matter?

Yes. For many service businesses a large share of enquiries come in the evening, when customers finally have time to sort things out. That's often exactly when nobody is replying.

Is an automated reply better than no reply?

Only if it's useful. An auto-reply that just says "we'll get back to you" doesn't hold the customer. One that gives a price or available slot usually does.

Do customers mind talking to an AI?

Mostly they mind waiting. If the answer is right and a person is easy to reach when needed, most customers are fine with it. Tell them it's automated.

One thing to do this week

Go through last month's WhatsApp enquiries and write down two times for each: when the customer messaged, and when they got a useful answer (not just an acknowledgement). Work out your median. Then check how many of the enquiries that went quiet were ones you answered slowly. That's your case, one way or the other.

If you want a hand pulling those numbers together, no charge: hello@phase2.sg.