Even if precisely measured, income data exclude important determinants of economic well-being, such as the hours of work needed to earn that income.

即使计算结果是精确的，收入数据也将一些经济幸福感的重要决定因素排除在外，如赚取该收入所需的工作时间。

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On a summer evening in Beijing in 2008, all those long, hard hours of work and commitment finally bore fruit.

2008年北京的一个夏夜，所有那些漫长、艰苦的工作和承诺终于有了成果。

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The factory timekeeper keeps account of the hours of work done.

工厂计时员记录工时。

《新英汉大辞典》

Many business owners agreed to follow codes or rules such as limiting the number of hours people could work.

VOA: special.2011.03.24

and a unit is generally 3 to 5 hours of work a week.

而且每门课通常是一周3到5个小时。

很好奇住宿生活 - SpeakingMax英语口语达人

And nine hours a week of outside-the-class work.

每周还有九个小时的课堂外工作。

麻省理工公开课 - 计算机科学及编程导论课程节选

Special projects like the football camp and the marathon require 30 hours of work a week.

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All told, it took him roughly 30 hours of work to build the app, he says.

WSJ: App Building, the Do-It-Yourself Way

The placements last for up to eight weeks, with up to 30 hours of work a week.

BBC: Derby