How long will you stay there?

你将在那里待多久？

How long will you stay there?

你要呆在那儿多长时间？

How long will you stay there?

你要在那里停留多久？

Mike: How long will you stay there?

麦克：你在那里呆多长时间？

How long will you stay there? - About 2 weeks.

你在那要呆多久？ -大约二周。

Please show your vaccination certificate at the counter over there later. How long will you stay in the US?

请呆会儿把你的种痘证书给那边柜台的人看。 你将在美国待多久？