Zenter - Working Habits for a succesful startup

I am still "offline" but this was so striking I wanted to record my awe. from here, (emphases mine)

What was a typical day or week like at YC?

We basically lived by the following schedule 7 days a week for 3 months. 10am - Noon: roll out of bed and stumble into the living room to sit at the computer, check email, blogs, news for the day and start coding Noon - 12:30: eat our $2 Lean Cuisine lunch - My personal favorite is Swedish Meatballs 12:30 - 7pm: Heads down coding, music played all day long and we alternated days to pick the play list which worked well 7 - 8: Kick Robby's ass at Tennis on the apartment courts. I think I may have won 3 sets over the entire 3 months. But they were always like 6-4 and it got us out for some exercise. 8 - 9: Make and eat gourmet dinner - mostly tombstone pizza, but occasionally Red Baron when they were on sale. Care packages from family were also extremely helpful to make sure we didn't eat too poorly. 9pm - 4am: Code like the wind - maybe do a design session or two if we are trying work through something particularly hard. 4am - 10am: sleep

I am impressed!