Are rig hours reversable?

Most of us burn in our rigs differently, but the general consensus whether it be speakers, ICs, power cords, electronics (the whole nine)is there is a positive ratio between hours played and sound quality. Is there a ratio for the reverse? How long can a rig go into hibernation without affecting all the positives of an active listening life? Obviously, there are differences between ICs, CDPs,power conditioners etc, but I'd love to hear your take from what you have read or from your experiences, and what you do to keep your rig alive when you're a way for a trip around the world or the like. thanks in advance.