2 of the guys at my work are like this. One guy sometimes is there at 6am and he leaves at 3. It's unbelievable that he can do such a thing, but he's a pretty sharp guy and he does good work.I prefer 7-4 if possible. Move forward an hour or two and I spend twice the amount of time in traffic.
When I still drove to work, I would often get to work at 7:30. Leaving my house early made a huge difference in travel time and frustration for the rest of the day.
