But he could not stay asleep. After an hour, maybe an hour and a half, he would wake up.

但是他睡着的时间太短，总是在一个或一个半小时之内醒来。

youdao

You thought about it maybe for a half an hour.

你想了大概半个小时。

youdao

You thought about it maybe for a half an hour.

你想了大概半个小时。

youdao