Until when can you stay?

你可以待到什么时候？

《牛津词典》

When would they be hired again? Perhaps, as the saying goes, when pigs fly.

他们什么时候会被重新雇用？也许正像俗话说的，等到猴年马月吧。

《柯林斯英汉双解大词典》

When did Handel live?

韩德尔是什么时期的人？

《牛津词典》

As Lincoln got on the train that would take him to Washington, he said: "I now leave, not knowing when -- or whether ever I may return.

VOA: special.2009.07.23

I know not what the younger dreams-- Some vague Utopia--and she seems, When withered old and skeleton-gaunt, An image of such politics.

我不知年幼者梦想什么-,某种模糊的乌托邦--她仿佛，当枯萎衰老瘦骨嶙峋的时候，这类政治的一个鬼影。

耶鲁公开课 - 现代诗歌课程节选

So what was your feeling there when you were, of course it's impossible to escape the Israeli-Palestinian conflict when you were in Israel especially. -Yeah.

那么你在以色列的时候又怎样的感觉？,你当然不可能避免巴以冲突,特别是当你在以色列的时候，-是的。

普林斯顿公开课 - 人性课程节选

At some point -- we're not sure when -- Sony's naming scheme for laptops got confusing.

ENGADGET

Have when-it-rains-it-pours Morton and other traditional producers stopped selling the plain old white stuff?

FORBES: Magazine Article

And when -- and everyone can encourage them to do the same, whoever they vote for.

WHITEHOUSE: The White House