Umm.... 24hrs. This girl turned it off (she didn't know what she was doing, or how to lock the keypad so she just held the power button). This thing is a chick magnet for geeks. And I'm talkin hot chicks. I got like 2 phone numbers and invited to a party after turning it on at the pool side to listen to music. (Then I whipped out my audio cables and used the pools speaker music to play music while I swam, lol)