Then how many hours of sleep should junior high school students get a night? The answer is nine.

那么初中学生每晚应该睡多少个小时呢？答案是9小时。

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How many hours does she sleep?

她每天睡几个小时？

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How many hours do you sleep every night?

你每天晚上睡几个小时？

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As part of the survey, the young people were asked how many hours of television or videos they watched daily.

VOA: special.2009.02.11

So, it could be that you're deciding, as a lawyer, how many hours you're going to spend on the job.

比方说你是个律师,你就要计划好为公司工作多长时间

耶鲁公开课 - 博弈论课程节选

How many hours do the students take classes usually?

学生们通常上几小时的课？

很好奇住宿生活 - SpeakingMax英语口语达人

The current law doesn't specify how many hours of practice new drivers have to complete.

WSJ: Driver's Ed, for Parents

The company tracks how many hours readers spend on particular titles and how far they get.

WSJ: Your E-Book Is Reading You

Before you buy something, think about how many hours you had to work to pay for it.

FORBES: Give Your Spending a Reality Check