多久

多久

"多久" means "how long."

多久 is used to inquire about the duration someone will need to complete a task.

你需要多久才能完成这个项目？

How long will you need to complete this project?

多久 is used to ask about the estimated duration of an event.

这场会议大概会开多久？

Approximately how long will this meeting last?

多久 is used here to express a long period without contact or seeing someone previously in a casual manner.

多久没看到你了，你最近好吗？

It's been so long since I've seen you; how have you been recently?