As with everyone who has a job or classes to go to, I usually watch my anime in the evenings from 9pm to 1-2am. For some reason I'm usually more in the mood to watch anime at night, but maybe that's just a subconscious reaction to my usual schedule.
I'm a college student so I don't have much time. But if I do have time, I basically watch all day, only to stop when I have to exercise, eat, drink, take a bath and sleep. But when I'm busy with college work usually I watch from 6 PM-10 PM