What is this "9 to 5" phenomenon?

Dear Lord, I miss protected posting.

1) A comment by a coworker makes me contemplate how I'm doing as a dad.
2) Two types of employees / "Other tasks as assigned"
3) She works days, he works nights, and how that's working.
4) Commute, lunch hour, and the letter.
5) What we talk about at oh-dark-thirty.
6) Black Friday.