The WhatsApp 24-hour window, explained without the jargon

Almost every confusing thing about business messaging on WhatsApp comes back to one rule. Once you understand it, the rest of Meta's policy stops feeling arbitrary.

The rule

When a customer messages you, a 24-hour window opens. Inside it you can reply with anything: free text, images, documents, as many messages as the conversation needs. When the window closes, you can no longer send free text. You may only send a message template that Meta approved in advance.

Every reply the customer sends restarts the clock. An active conversation effectively never closes.

Why the rule exists

It is what stops WhatsApp becoming a marketing channel businesses can push into uninvited. The window is permission, and it expires. Meta enforces this seriously, because the moment people stop trusting the inbox the platform loses its value.

What this means in practice

• Answer fast, and not only for the customer's sake — a slow reply can arrive after the window has shut.
• Overnight and weekend messages are exactly where businesses lose the window without noticing.
• Re-engaging an old lead is a template, not a chat. Write and submit those in advance.
• A template rejected at 6pm cannot be fixed by rewording it and sending anyway.

Where numbers actually get restricted

Businesses rarely get in trouble for one bad message. They get in trouble for patterns: bulk sending to people who never opted in, repeated template rejections, and blocks or reports from recipients. Quality rating is visible in Meta Business Manager and worth checking, because it moves before a restriction lands, not after.

The safe shape

Reply to inbound conversations instantly so you are always comfortably inside the window, keep a small set of approved templates for genuine re-engagement, and never message someone who did not ask to hear from you. Do that and the rule stops being something to manage.

whacl enforces the window in software rather than leaving it to whoever is typing: instant replies inside it, approved templates outside it.