I can't find a search function on the forum and even though I looked through the 17 pages of topics, I didn't see this (which doesn't mean it wasn't there, just that I didn't see it, in case it is there).
Having gone through all that, my question is simple. I'm reading Student Assistance by Radio Guy. I don't think I've ever seen anyone spell out Mister and Missus every single time before this story, even in dead tree books. (Or again, at least the ones I've read.) I have seen the occasional Mistress and Master used, which are what Mrs. & Mr. really mean, but in actual written dialogue, I think this is the first time I've seen it.
Note this is not to be construed as any type of criticism whatsoever - I'm just curious now which and what everyone uses. And whether you would switch when writing dialogue, where the word would be spelled out, versus author exposition, where you might use the abbreviation.
(I may also have an ulterior motive in asking, something about another story I'm working on ...)