the hours during the day when people who work in offices are usually at work

I'll have to do it outside/out of (= before or after) office hours. 我必须在办公时间之外做此事。

Their phone lines are only open during office hours. 他们的电话只有在上班时间才接得通。

the times during the day when you can go to see a doctor, dentist, professor, etc. at his or her office

Many doctors have evening office hours. 许多医生在晚上也接待病人。

Compare: surgery (ADVICE)