多久

nǐ yī bān duō jiǔ jiàn tā yī cì

你一般多久见她一次？

How often do you see her?

tā men suàn cuò le dào nà lǐ yào duō jiǔ

他们算错了到那里要多久。

They miscalculated how long it would take to get there.