Examples
wǒ我nǚ ér女儿měi每tiān天shuì睡bā八gè个zhōng tóu钟头。
我女儿每天睡八个钟头。
My daughter sleeps eight hours a day.
票不到一个钟头就卖得精光。
All the tickets sold out in an hour.
为了不被洪水冲走，有的人紧紧地抱着树干长达数个钟头。
Some people clung to tree branches for several hours to avoid being washed away by the floodwaters.