I have school from 8 AM-3 PM (PST), but I'm a second semester senior, so I slowly write music on my netbook. School internet's not that great, though, and I don't have a mouse, so it's mostly just brainstorming for tunes.
I get home around 4 PM, and from then to 11 PM I can pretty much just write music nonstop, assuming I have some kind of ditty in my head. I didn't have much inspiration yesterday, so I just spent a couple hours messing around with blues scales.
So to answer your question, all I really do nowadays that's not sleeping or eating is write music.