If I add almost all my mp3s to a single playlist (a few I leave out because I want to keep them for some reason, but don't generally want to hear in rotation), I have 7.8 solid days of music. An awful lot of it is legit, too (for example, I ripped a bunch off the like 30 Cure discs I have). I have no idea how this compares to anyone else out there. How many hours have you got?