Mum, I have been waiting for another apple for about 2 hours.

妈妈，我已经等着吃另一个苹果有两个小时了。

youdao

About 2 hours, I have a schedule. Would you like to check the time first?

大约2小时。我有时刻表在手上，你要先看一下时间吗？

youdao

I finished the race in about 2 hours (minutes and seconds didn't matter yet).

我用2小时完成了这次比赛(分秒并不重要)。

youdao

It is mixed for about 2 hours with some common chemicals and then allowed to cool.

VOA: special.2009.01.26

where you show up about 2 hours before the show,

演出开场前两小时你到场，

实惠的歌舞剧 - SpeakingMax英语口语达人

Cover tightly with plastic wrap and let rise at room temperature until doubled in size, about 2 hours.

NPR: Two Centuries of 'Baking in America'

Cover tightly with plastic wrap and let rise at room temperature until almost tripled in volume, about 2 hours.

NPR: Two Centuries of 'Baking in America'

Cairo time and protesters breached the wall about 2 hours later.

FORBES: Time-Line Of Cairo Events Reveals Romney's Deeply Flawed Rush To Judgment