They waited for about two hours.

他们等了大约两个钟头。

《柯林斯英汉双解大词典》

After spotting a wallet on the front seat inside a parked car with its window down, he stood guard in the rain for about two hours waiting for the owner to return.

他透过摇下的车窗，在一辆停着的车的前座上发现了一个钱包，于是在雨中守了大约两个小时，等待车主回来。

youdao

I only sleep for about two hours a day.

我一天只睡两个小时。

youdao

It is mixed for about two hours with some common chemicals and then allowed to cool.

VOA: special.2011.07.25

And if you are prepared to stand up for about two and a half to three hours to watch a play,

而且你要准备好了站上大约两个半小时到三个小时，去看一场戏剧，

莎士比亚环球剧院 - SpeakingMax英语口语达人

The older kind of submarine used in World War Two could stay under water for only about forty-eight hours.

VOA: special.2010.06.11

He ran for about two hours, always heading downhill, until he entered a mountain valley.

WSJ: Escape From a North Korean Prison

Users reported problems accessing Facebook.com in many countries, including the UK, for about two hours.

BBC: Facebook hit by technical problem across Europe

We have been out in the bay for about two hours and have not seen another boat.

CNN: King: Waterman finds Chesapeake Bay 'dying daily'