Hello Mary Henrielle Babar (PH),
Thank you for reaching out on the Microsoft Q&A forum.
The flow can wait up to 30 days by default for a response. This timeout can be customized to a shorter or longer duration. The flow is synchronous during the approval step. It pauses until the user responds (approved/rejected) or the timeout period expires.
If you are still facing any issue, please let us know in the comments and where you are encountering this error along with the screenshot for reference. We are glad to help you.
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Thank you.