You see, we had a busy family, with sports and Scouts and hobbies and trips. We didn't abdicate our life planning to their school teacher(s). We planned, and learned and performed and worked. If homework fit into that, fine. If not, fine.
Teacher, take your 8 hours and use them efficiently. Lecture less and do problems more. Have study time at school. Because you get those 8 hours and no more.
How did it turn out? One former soldier, back at University studying Mechanical Engineering. One MSCS grad at a startup in Silicon Valley. One musician (played cello for city orchestra in High School; soloed on NPR, you may have heard him) turned CS in college.