OK, i've been leaving my iPod playing on shuffle all since 2:11PM yesterday. Brightness is set to lowest, i kept it locked for most of the time. Wifi is off, and volume is at about 60%. its 2:15 and its still going strong! about 7% battery life left, i'll post updates once it dies Start time: 2:11 End time: 4:27 26 hours and 16 minutes!