M.M.
I don't have study rules in the house, nor do I have homework rules. If the girls don't do their homework and get a bad grade then I let the teacher take care of it by giving them that low grade. That being said, my daughter is in two AP classes and always does her homework and then some in those two classes. She is very competitive and usually gets everything turned in. She spends maybe a couple hours a night on homework/studying
If you are talking about a foreign county, he will study A LOT!!! My student had to study all evening her first couple weeks here. She needed a dictionary for everything. It took her sometimes 6-8 hours to finish.
Her biggest issue was the math and science vocabulary that is not taught in conventional language courses, like perimeter, circumference, cube, isotropes, etc.