钟点；小时

原形：hr

The project is expected to take approximately 500 hours to complete.
这个项目预计完成需要大约500小时。
She works 40 hours a week at her full-time job.
她在全职工作中每周工作40小时。
We have a 24-hour customer service hotline available.
我们有一个24小时客户服务热线可供使用。
He has been traveling for over 16 hours straight without rest.
他已经连续旅行了超过16个小时没有休息。
The restaurant stays open until midnight, serving customers for 18 hours daily.
餐厅营业到午夜，每天为顾客服务18小时。
It took them 7 hours to hike up the mountain and only 3 hours to come down.
他们花了7个小时爬上山，而下山只用了3个小时。
I've spent about 300 hours studying for my exams this semester.
这学期我花在备考上的时间大约有300小时。
The new software was developed in just 8 hours by the programming team.
这款新软件由编程团队仅用8小时就开发出来了。
She managed to sleep for 8 solid hours last night, which is rare for her.
昨晚她一口气睡了8个小时，这对她来说很罕见。
They completed the race in under 2 hours, setting a new record.
他们在两小时内完成了比赛，创造了新的记录。