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等于什么? How many hours are there in 7 days how many hours one day? How many hours are there in 7 days?这个英语单词是什么意思 How many days this month:days How many,how ofen,how much,how long的区别 Name What How long How many how how tall how long how big how wide how heavy how many ho how old,how long,how soon,how often,how far ,how many,how mu How；How many； How much； How long； How often；How big； How hea 对 several hours 提问用how soon 还是how long?