We have them for five hours and we have them work.

我们给学生五个小时,让他们工作。

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We've been stuck in it for five hours now.

我们已经被困在里面5个小时了。

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I think for the past three months, I've only had five or six hours of sleep at night.

我觉得在过去三个月里，每晚我就睡5到6个小时。

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