Here was my schedule for the first 2 years. Take into consideration that I was a gunner who wanted to specialize:
Be at school and in my seat for lecture by 8:00. There were a few scattered 7am classes. Sit in class until either 2pm or 5pm. If it was 2pm it was because we went to the lab until 5pm. So it was 5pm either way. After 5, I would stay in the lab to finish whatever work I was doing, because there was always practicing and extra work. When I left the lab i would go study in the library until it closed at 11pm. Then I would go home to give the wife the pickle-tickle, go to sleep, and do it all over again the next day.
I would usually sleep later on weekends and show up at the library when they opened at 9am. Then I would study until 9pm. 12 hours straight was definately my max because I started going cross-eyed after that. Then I would go home, kick the dog, drink a beer or four, and go to sleep. And repeat.