我每天做两小时运动。

Wǒ měitiān zuò liǎng xiǎoshí yùndòng.

I do two hours of exercises every day.

我已经等了你三个小时了！

Wǒ yǐjīng děngle nǐ sān gè xiǎoshíle!

I've already waited for you for three hours!

我睡了八个小时。

Wǒ shuìle bā gè xiǎoshí.

I slept for eight hours.