原句型为 It takes sb (time一段时间) to do sth
翻译为：某人做某事花了多少时间；it 是形式主语,真正的主语是不定式to do sth
How long does it take you to go to the Great Wall?你用多长时间到达长城
how far多远,这里不能和人you 同时出现,应表示为How far is it from your school to the Great Wall?你学校距离长城有多远?