When I was in high school I did about 3 hours a night. I was in advance classes so that might had something to do with it. I have two boys in high school and I doubt they did 3 hours of homework all year.
I almost never did my homework and my grades showed that, luckily it didn't effect graduation or going through college!
But college really kicked my ass when it came to homework especially my last couple of semesters.
Never had any homework after the first few grades of elementary schools. Especially not in college. I find it baffling that you people have homework in college. We had projects and stuff, but never regular homework.