He works long hours to the detriment of his health.

他长时间的工作，有损健康。

youdao

My father watches bicycles. He works very long hours.

我父亲帮别人看自行车，他工作时间很长。

youdao

My father watches bicycles. He works very long hours.

我父亲帮别人看自行车，他工作时间很长。

youdao