With that convoluted title I’m making myself think about what we’d call the additional days on other planets or other different temporal circumstances.
Instead of ending them with -day you could end them with the planetary body name or circumstance name. Today might be Lajove on Jupiter!
One of my favorite moments in Downton Abbey; when he says, I can do it on the weekends; and the Countess (Maggie Smith) says “what’s a week end?”
It just killed me. Yeah she’d be so out of touch with workers that she’d have no context. lol