Not nearly enough
Sometimes I can go days without drawing, either because I just don't have the time or because I'm too tired to get anything done, and then I feel guilty for not spending all the time I can on drawing since I have so little time for it to begin with. And I also try to work as a freelance illustrator/graphic designer while having a full-time job, so other types of drawing sometimes just doesn't happen. When I do have the time, it's usually no more than 1-3 hours (that's weekdays). This is one of the few things I miss about being a student. I had a lot more time for drawing than after I got a full-time job. And I thought it would be the other way around...so naĆÆve :S
So true. Every once in a while I think that I can manage at least one day a week with like...only four hours of sleep, and I'll stay up late and draw, and then I'll be reduced for DAYS, because I never manage to catch up with the lack of sleep. So I actually end up having less energy and time for drawing as a result.
Also true! My wrists have survived so far, but due to having a job where I do very similar movements with my arms as when I draw, I got shoulder pain that lead to inflammation and had to quit working and drawing for a while...