how many hours（days..）可不可以等于how long?

how many hours（days..）可不可以等于how long? How many hours are there in 7 days How many hours are there in 7 days?这个英语单词是什么意思 how many minutes in 2 hours how many hours are in a day how many hours one day?for happy How many hours do you sleep every night?中的how many hours how much time how long how often how many days are there in this How many mouth have 28 days? 1.How many mother have 28 days How many days have you off school? How many days does a year have? How many days are there in December? Jeff starts work at 8.45am and finishes work at 5.15pm.He has 90 minutes of breaks.How many hours does he work in 5 days? 英语翻译How many days are there in a year How many days make a year How many hours will you stay for?这话有错吗How mang hours will you stay? How many hours did you study English last week?回答 How many hours are there in a day?