If you generously apply Tefgel, you can leave if assembled for months, if not years.
That's my experience. I've only taken the wings off the fuselage 2 or 3 times in over two years.
Each time I did, I reapplied a thick layer of tefgel. Never had a problem, and just verified that I still don't
As for the fuselage to the mast, I have to disassemble anyway to fit it in the car, so I take it off after every session.
I did have some tefgel on these bolts too, but I found that by repeatedly screwing the bolts in and removing them, the tefgel soon came off anyway, so in the end I stopped bothering.
So you kind of got to go one way or the other.
I got an Zeeko mast, it came factory fitted with the base plate bolted to the fuselage with tefgel coated stainless bolts, with the recommendation never to disassemble it.
So they must have have had some confidence that it wouldn't be a problem.