你们在酒吧待了多久？

Nǐmen zài jiǔbā dāi le duōjiǔ?

How long did you stay at the bar?

从这里到学校要走多久？

Cóng zhèlǐ dào xuéxiào yào zǒu duōjiǔ?

How long does it take to walk from here to the school?

从上海到北京坐飞机要多久？

Cóng Shànghǎi dào Běijīng zuò fēijī yào duōjiǔ?

How long does it take to go from Shanghai to Beijing by plane?