The US? My 2nd grader has one piece of homework per week, which takes about 10 minutes. If there was more I would tell the teacher to shove it. Instead I talk to my child. If he's interested we talk more about that, otherwise we switch to a topic that interests him. We've covered a lot of science, astronomy and math. Lately I've been telling him about primes, factorization and cryptography. I think our conversations lead to a love of learning and curiosity that is 100x more beneficial than a 50cm stack of homework...