So I know you're supposed to leave an amp in standby mode to let it warm up, but how long should it be in standby mode? Also, I commonly will take hour long breaks (sometimes longer) to play piano. Would it be better to turn my amp off during these breaks or just leave it in standby mode? What's the longest you can leave an amp in standby mode without doing any harm to the tubes? These are all questions that I have sought answers to and never received a clear response. Any help would be greatly appreciated!