[TeMPOraL]

Beyond unversities, it's also a term sometimes used by Y Combinator, which also contributes to its spread.

(That's how I learned it can mean something else than "when the workplace is open". English is not my first language.)

[Aeolun]

I think in this case it’s meant to be ‘hours when I’m guaranteed to be in my office’.

Mostly applicable to academia, because who the hell has their own office right now.

[vidarh]

Well, at the moment my office hours are 24/7, but I'm not going to be pleased if somebody drops by.