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https://developers.facebook.com/docs/messenger-platform/policy/policy-overview#standard_messaging

Standard Messaging

The following is an overview of policies that apply to Messenger Platform integrations that use standard messaging. For complete policy details, see the Messenger Platform section of the Facebook Platform Policy.

24-Hour Messaging Window

Businesses and developers using the Send API have up to 24 hours to respond to a message sent by a person in Messenger when using standard messaging. A bot may also send one additional message after the 24-hour time limit has expired. The 24-hour limit is refreshed each time a person responds to a business through one of the eligible actions listed in Messenger Conversation Entry Points. This is commonly referred to as the '24 + 1 policy'.

For information on how you may be able to send messages outside the 24-hour messaging window, see the Tags documentation, and Sponsored Messages.