Key takeaways
- The 24-hour customer service window opens when a customer messages your business.
- Inside the window you can send free-form text, media and interactive messages without a template.
- Every new message from the customer restarts the 24-hour timer.
- After the window closes, the business must use an approved template message.
- Click-to-WhatsApp ads and Facebook Page CTAs can open a 72-hour free entry point window when the business replies within 24 hours.
If you have worked with the WhatsApp Business API, you have probably hit this wall: a customer asked a question yesterday, you try to reply today, and the message will not send. That is the 24-hour customer service window at work.
What is the WhatsApp 24-hour window?
The customer service window is a 24-hour period that starts whenever a customer sends a message to your business. During that period you can reply with any kind of message, text, images, video, documents, location, buttons and lists, without needing a pre-approved template.
When the window closes, you can only contact that person again with an approved template message.
How does the timer work?
- Opens: when the customer messages you (including tapping a quick reply button).
- Resets: every time the customer sends another message. The 24 hours count from their latest message.
- Does not reset: when you send messages. Only the customer's messages count.
- Closes: 24 hours after the customer's last message.
A worked example
| Time | Event | Window status |
|---|---|---|
| Mon 10:00 | Customer asks about delivery | Open until Tue 10:00 |
| Mon 10:05 | Agent replies with tracking link | Still open until Tue 10:00 |
| Mon 18:30 | Customer says "Thanks, one more question" | Reset, open until Tue 18:30 |
| Tue 19:00 | Agent wants to follow up | Closed, must use a template |
| Tue 19:40 | Customer replies to the template | New window open until Wed 19:40 |
What can you send inside the window?
- Free-form text replies from agents
- Images, videos, PDFs and voice notes
- Interactive buttons and list messages
- Product and catalogue messages
- Location and contact cards
- Automated chatbot flows
This makes the window the natural home for support, pre-sales questions and order changes. It is also cost-efficient: service messages are free for the first 1,000 per number each month and cost ₹0.145 each after that in India. See WhatsApp conversation pricing.
What can you send after the window closes?
Only template messages. Choose the right category:
- Utility: to follow up on an order, appointment or issue.
- Marketing: to share an offer or re-engage.
- Authentication: to send an OTP.
The customer must also have opted in to hear from you.
What is the 72-hour free entry point window?
When a customer messages you from a Click-to-WhatsApp ad or a Facebook Page call-to-action button, and your business replies within 24 hours, Meta opens a 72-hour free entry point window. During those 72 hours, messages, including templates, are not charged. It is one of the best reasons to run Click-to-WhatsApp ads.
How do you make the most of the 24-hour window?
Reply fast
The window is a deadline. A shared team inbox with assignment rules makes sure chats are picked up quickly, and SLA reports in analytics show where replies slip.
Automate first responses
A no-code chatbot can answer common questions instantly, even at night, and hand off to a human with full context. That way no chat quietly times out.
Encourage customers to reply
Templates with quick reply buttons ("Track order", "Talk to support") invite a response, which reopens the window for free-form follow-up.
Train agents on the rule
Make sure every agent knows to check when the customer last wrote. If it was more than 24 hours ago, they should reach for a template instead of typing a free-form reply that cannot be delivered.
Keep templates ready
Create utility follow-up templates in advance, for example "We are following up on your query about {{1}}. Reply to continue the conversation." - so agents can reopen a closed chat in one click. Ready-made examples live in the template library.
How does the window affect cost?
Inside an open window, your first 1,000 service messages per number each month are free (₹0.145 each after that in India), and under Meta's current per-message pricing, utility templates sent while the window is open are generally free too. Marketing templates are charged whether or not a window is open. Once the window closes, any template you send is billed by category, ₹1.09 for marketing and ₹0.145 each for utility and authentication in India from 1 October 2026, according to Chatbox AI's pricing page. These rates change periodically, so treat them as a guide.
The practical lesson: resolving questions while the customer is still engaged is both better service and cheaper.
Common questions agents ask
"The customer said they would reply later. Can I nudge them tomorrow?" Only with a template if more than 24 hours have passed since their last message.
"Can I send a promotion inside the window?" Yes, free-form messages inside the window can include offers, but keep it relevant to the conversation. Unwanted promotions lead to blocks, which hurt your quality rating.
"Does a missed call or a reaction count?" Treat only actual customer messages and button replies as openers; do not rely on other signals.
Summary
The 24-hour window rewards businesses that respond quickly and invite two-way conversation. Pair a fast inbox with a chatbot and good templates, and it becomes an advantage rather than a limitation.
Start your 7-day free trial of Chatbox AI to manage every window from one shared inbox.
Frequently asked questions
A free-form message will not be delivered once the window has closed. You need to send an approved template message instead. If the customer replies to it, a new 24-hour window opens.
What happens if I reply after 24 hours? A free-form message will not be delivered once the window has closed. You need to send an approved template message instead. If the customer replies to it, a new 24-hour window opens.
Does my message reset the 24-hour window? No. Only messages from the customer open or reset the customer service window. Your own replies do not extend it.
Are messages inside the 24-hour window free? Meta gives each number 1,000 free service messages a month, then charges ₹0.145 per service message in India. Under Meta's current pricing, utility templates sent within an open window are generally free too, while marketing templates are still charged.
Can a chatbot reply inside the 24-hour window? Yes. Chatbots and automated flows can send free-form and interactive messages inside the window, which is why bots are an efficient way to answer common questions.
Is the 24-hour window the same as a conversation? They are related but not identical. Meta used to bill per 24-hour conversation. It now charges per template message, but the 24-hour customer service window still decides whether you can send free-form messages.
