This may seem ridiculous but I'll give it a shot anyway. Always very interested in history, especially figuring out where sayings came from. Been watching Downton Abbey for probably the hundredth time and there is a saying that is repeated multiple times. Anytime it's a complicated issue that will take time to work through, someone says "it won't be done by next Tuesday." It's finally broken me and I'm dying to know where this colloquialism came from.
I tried a few internet searches with various wording and nothing productive has come of that. I know the writers did a lot of research, so perhaps it is period specific, though it could be a common English saying that is modern they slipped in not thinking about it. Please someone satisfy this burning curiosity!