how many hours ,how much time ,how long 有什么区别?

How many hours do you sleep every night?中的how many hours how much time how long how often how many minutes in 2 hours how many hours are in a day how many hours one day?for happy how many hours（days..）可不可以等于how long? How many hours will you stay for?这话有错吗How mang hours will you stay? how many hours ,how much time ,how long 有什么区别? how many hours中的how many 作的事表语还是定语? How many hours did you study English last week?回答 How many hours are there in a day? How many hours do you sleep every day?怎么回答 How many hours are there in 7 days How many hours do you sieep every day怎么回答 how many hours you watch TV each day,on average? How many hours does the store friendly什么意思 how many hours does he work every day? How many hours __ he sleep every day? 请问 how many hours的同义句是什么?急用