How long is it from the library to his home?

问题描述:

How long is it from the library to his home?
错误在哪
2.It's five minutes walk from here

How far is it from the library to his home?(距离用far,long一般是问时间的长短)
It's from five minutes' walk from here.(这里要用名词所有格,意思是五分钟的路程)