Since we don't have set work hours, there's a lot of variety to my daily routine. If I'm in SF, I'll usually get out of bed around 9am, roll over to my desk and deal with email and catch up on tech news. I'll head into the office around 11am and do any of a million different things there. Between 6pm and 8pm I'll think about heading home. Maybe a few of us will hit a bar first or grab dinner at a close restaurant. Right now it's 10:15pm and I'm coordinating with vendors via email and talking with some of the GitHub guys in Campfire.
It's rare that a day will go by that I don't work on GitHub in some fashion. I like to get out into nature on weekends to refresh my creative energy and get some exercise, but I'll still be checking email and maybe writing some code or jotting down ideas I had on the ride.