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WhatsApp Business API • Messaging Rules and Compliance • 3 min read

WhatsApp Business API session window

Learn how WhatsApp session windows work, when they open/close, and how to stay compliant.

The session window on WhatsApp Business API is the 24-hour period where you can send free-form responses after a user message. Managing sessions well keeps you compliant and responsive.

Key takeaways

  • Session opens when a user messages you and lasts 24 hours from that timestamp.
  • Inside the window: send free-form replies; outside: use templates.
  • Timely responses and SLAs help avoid extra template costs.

Related guides worth reading next

Strengthen this topic cluster by also reading What is 24-hour rule in WhatsApp Business API?, Can we send message after 24 hours?.

Staying compliant

  • Use approved templates after 24 hours to re-engage.
  • Avoid sending unapproved content outside the window.
  • Monitor SLA timers to respond before the window closes.

Operational tips

  • Set alerts for aging conversations approaching 24 hours.
  • Use bots to acknowledge and triage instantly.
  • Route high-priority chats to agents to stay within the window.

FAQs

Do weekends affect the 24-hour timer?

No. The timer is continuous from the last user message, regardless of day.

Can I pause the timer?

No. The 24-hour clock cannot be paused; prioritize timely replies.

Does a template send open a session window?

Templates start a conversation, but free-form replies still require the user to respond to open a service window.

Explore more WhatsApp Business API resources

Messaging Rules and Compliance

What is 24-hour rule in WhatsApp Business API?

Definition of the service window and what you can send inside or outside 24 hours.

Messaging Rules and Compliance

Can we send message after 24 hours?

Using templates to restart conversations after the service window closes.

Messaging Rules and Compliance

WhatsApp Business API message limits

Messaging tiers, quality signals, and tips to increase limits.

Messaging Rules and Compliance

WhatsApp Business API policy rules

Allowed/disallowed content, opt-in, opt-out, and template guidelines.

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