The 72-hour free window most advertisers never use

The free entry point window is a 72-hour period, opened when someone reaches your business by tapping a Click-to-WhatsApp ad or a Facebook Page call-to-action button, during which your messages to them are free. It is three times the length of the ordinary customer service window, and it is documented on Meta's pricing page.

Almost nobody uses it. Advertisers pay for a click, send one greeting, and let the remaining seventy-one hours expire — which is a strange thing to do with the most expensive traffic you buy.

How it differs from the ordinary window

	Customer service window	Free entry point window
Length	24 hours	72 hours
Opened by	Any customer message or call	An ad click or Page CTA
Resets?	Yes, on each new customer message	Runs from the entry point
Your messages cost	Nothing	Nothing
Free text allowed	Yes	Yes

Both are documented by Meta, and both work the same way from your side: inside either one you can send free text, images, buttons and price lists with no template and no charge. Meta made service conversations free and unlimited from 1 November 2024, per its sending messages documentation.

What opens it

• A Click-to-WhatsApp ad. A Facebook or Instagram ad whose button opens a chat with your business rather than sending the person to your website.
• A Facebook Page call-to-action button configured to message your business.

What does not open it: a wa.me link on your website, a QR code on your packaging, or a customer finding your number and messaging you. Those are ordinary customer messages, so they open the normal 24-hour window instead — still free, just shorter.

What to do with three days

The window is long enough for an actual sales conversation, which is unusual. A structure that works:

1. Greet immediately, referencing the ad. The lead should know they landed in the right place.
2. Ask one qualifying question with buttons — what they are interested in, or which product. Save the answer.
3. Answer properly. Send real photographs rather than links. Media is free inside the window, and a picture answers a sizing question better than a page does.
4. Get a person involved early. This is your most expensive traffic; a menu that exhausts them before a human appears is optimising the wrong thing.
5. Nudge once if they go quiet — a wait step, then a branch on whether they replied, then one message on the silent path.
6. Nudge once more before the window closes, then stop.

Two nudges is the ceiling. A lead who has ignored two messages in three days is not recoverable by a third, and the blocks that produces damage the quality rating you need for everything else.

What happens when it closes

The same thing that happens when any window closes. Free text stops working, and a further message needs an approved template — which is charged, and, if it is marketing, cannot reach a US number at all.

So the practical rule is: get whatever you need from the conversation inside the 72 hours. If the lead is still warm at hour seventy, send the message now rather than tomorrow.

One nuance worth knowing: if the lead replies at any point, that reply opens a fresh 24-hour customer service window on its own. A conversation that stays alive therefore keeps renewing itself, and the 72-hour clock stops mattering.

Reporting the conversion back

A flow that qualifies ad leads should tell Meta when one converts, using the conversion step. Meta's delivery optimises toward whatever you report, so the timing decides what the algorithm learns to buy you.

• Reporting on the first hello teaches Meta to find you people who say hello.
• Reporting after qualification teaches it to find buyers.
• Reporting a purchase with the real order value makes your return on ad spend meaningful.

Without it, your reported return on ad spend misses every sale that completed inside the chat — which for a WhatsApp-first store can be most of them. The flow is in automating Click-to-WhatsApp ad leads.

Detecting an ad lead in a flow

Use the Came From a Facebook Ad condition, which passes only for someone who arrived by tapping an ad. Two things to avoid:

1. Do not put a first-message check before it. The condition already fires only on the ad click itself and never on the lead's later messages, so an extra check just blocks people who click your ad a second time.
2. Do not use a tag to identify ad traffic. Tags are labels you apply later, and a brand-new lead has none — so a tag condition blocks everybody.

The summary

You have already paid for the click. The window is Meta's way of letting you convert it without paying again, and it is three times longer than most people assume. Use it deliberately: qualify, answer properly, involve a person, and stop after two nudges.

And treat the numbers here as a snapshot. Meta revised pricing mechanics on 1 July 2026 with further adjustments scheduled for 1 October 2026, so the pricing page is the live source rather than any blog, including this one.

What the window is worth in practice

It helps to put the difference in concrete terms. Consider a lead who clicks your ad on Friday afternoon and does not reply until Sunday morning.

Window	Friday 3pm click	Sunday 10am reply	Result
24 hours	Opens	Window closed Saturday 3pm	You needed a template to stay in touch
72 hours	Opens	Still open until Monday 3pm	Free conversation, no template

That is not an edge case. Leads from weekend ad spend routinely reply a day or two later, and the extra 48 hours is exactly the difference between catching them and needing an approved marketing template you may not have — and which cannot reach a US number at all.

Why most advertisers waste it

Three habits, all of them fixable:

1. Sending a statement instead of a question. "Thanks for your interest, visit our website" ends the conversation at the moment it opened. A question keeps it alive and gets you a reply, which resets the clock again.
2. Routing ad leads through the same menu as everyone else. This is your most expensive traffic; four self-service options before a human appears is optimising for deflection when you should be optimising for conversion.
3. Never following up. A lead who goes quiet at hour two is not gone at hour twenty. One nudge inside the window costs nothing.

What you can send inside it

Everything. Free text, photographs, videos, PDFs, buttons and list menus — with no template and no charge, exactly as in an ordinary open service window.

That makes it particularly good for categories where the sale depends on questions a landing page answers badly: fit and sizing, materials, delivery timing, whether a variant is suitable. Sending three photographs and answering two questions is often the whole sale, and it is free.

How it interacts with the other limits

• Messaging tier. The customer started the conversation, so it does not count against the cap on unique customers you may start conversations with — which begins at 250 per rolling 24 hours per Meta's messaging limits documentation.
• Per-user marketing limits. Do not apply to messages inside an open window.
• The US marketing restriction. Also irrelevant here, because you are not sending a marketing template — you are having a conversation. This is one of the few routes by which a US-facing store can discuss products and offers at all, and it is covered in what's left for US stores.

That third point deserves emphasis. For a US store, Click-to-WhatsApp ads plus the free entry point window is not merely a nice acquisition channel — it is the main route to promotional conversation the platform still allows.

A checklist before your next campaign

1. The flow behind the ad is published, not sitting as a draft.
2. The greeting references the ad so the lead knows they are in the right place.
3. The first message asks something rather than announcing something.
4. A person is reachable within two taps.
5. A single follow-up is wired for leads who go quiet.
6. The conversion step fires after qualification, not on hello.
7. You have tested it by clicking your own live ad, since the ad-source condition cannot be exercised any other way.

Test that last point before you spend. An ad-source condition that does not match means the whole flow is skipped and your paid clicks land on silence, and it is the one failure the simulator cannot show you.

Everything else on this page is an optimisation. That one is the difference between a campaign that works and one that quietly does not, and it is worth ten minutes before you set a budget live.