A: How long will you be staying in the United States?

你将会在美国停留多久?

B: I plan to stay for about 10 days.

我打算停留约10天。

A: How long will you be staying in this country?

你将在这个国家停留多久?

B: I'm just passing through. I am leaving for Geneva tonight.

我只是过境而已。我今晚就前往日内瓦。