Instant verification codes
Recommended window: 30 minutes. That covers one delivery attempt, a short delay, and one cautious resend.
Email lifetime timeline
New FWD addresses are kept for 3 hours by default. Use the time remaining and the type of task to decide whether to extend it instead of keeping it indefinitely.
Quick estimate
If you expect to wait 20 minutes, keep the address for at least 40 minutes. If you still need a second confirmation, refund, or manual review, a temporary email is not a good fit.
Recommended window: 30 minutes. That covers one delivery attempt, a short delay, and one cautious resend.
Recommended window: 3 hours. Let the address expire once the download is complete and you have confirmed that you will not need to retrieve anything later.
Recommendation: Don't use a temporary address. Future messages may arrive at unpredictable times, so use long-term forwarding or your regular email address.
Decision points
Extend the address only to finish the current task. Changing addresses destroys the old inbox, so save anything you need first.