I'm currently restoring a MacBook from a Time Machine backup. Estimated time for completion is 3 hours. I'm traveling and will have to pack it up in 30 minutes. Will that cancel the restoration process? If so, how delicate would such a cancellation be? Might it lead to a corrupted state?
It will put the MacBook to sleep, which effectively pauses the restore.
Since you're restoring from external media even if the MacBook itself doesn't recover nicely when woken back up you could simply start another restore from the same Time Machine drive.