Hour is the English word for "小时" and it comes from the Old English "hour" which comes from the Latin "hora" which means "hour" or "time". Here are some example sentences:

I will meet you in an hour. (我会在一小时内见到你。)

She works eight hours a day. (她每天工作8小时。)

It takes about an hour to drive to the beach. (开车到海边大约要一小时。)