They can't stay for long.

他们不能停留很长时间。

youdao

I can't stay for long as I have an appointment in 20 minutes' time.

20分钟以后我还有一个约会，所以我不太呆久了。

youdao

Don't stay out in the sun for too long—you can't be too careful.

别在太阳底下待得太久，你得尽量小心。

《牛津词典》

"I will come back just after a year, because I can't stay home for that long, " she added.

BBC: May's leap is just enough

You can't really expect things to stay the same for very long, which turns every outing into an exploration.

CNN: Tokyo: A local's view

The result is that while officials can pencil in Federer for at least five matches at Grand Slam tournaments he last lost before the quarterfinal round nine years ago they can't count on him to stay on court for very long.

WSJ: Does Roger Federer Have Someplace Else to Be?