Sunday is a normal working day for me.

星期日是我的正常工作日。

What's he doing home on a working day?

工作日他在家里干什么？

A typical working day for me begins at 7.30.

我的工作日一般在7:30开始。

I spend most of my working day sitting at a desk.

我一天之中大部分工作时间都坐在办公桌旁。

His working day starts at 3:30 a.m. and lasts 12 hours.

他每天的工作时间从早上3:30开始，持续12个小时。