I need to go to the bathroom.

我必须上趟厕所。

I have to answer the call of nature.

我得上厕所。

I need a rest stop.

停车，我要上一趟卫生间。

Time for a pit stop.

停一会儿车，以便大家上厕所。

How long can you wait?

你还能忍多久？

Is it an emergency?

紧急吗？