Millions more suffer from serious sleep deprivation caused by long work hours.

还有数百万人由于工作时数长导致他们严重睡眠不足。

In some countries, people who get flu outside of work hours need a doctor's certificate.

在一些国家，人们非工作时间得流感需要医生的证明。

Work hours are hard to predict.

工作时长难以预计。

Make personal calls during work hours?

上班打私人电话？

Unsurprisingly, most do their reading during work hours.

大部分人在工作时间阅读。