The other day I was chatting about my PAR project and how, compared to my other current projects, it’s quite long (or will be). I know this because I know the world is ‘huge’, but it’s interesting that I know that without having finished shaping the world yet!
I still have a few large decisions to make about it to ensure the mechanics of the whole thing make sense, so it could actually get a bit bigger or a bit smaller depending on those choices. Having said that my sense of its ‘size’ is really a gut thing. I’ve always found that very soon after I envisage a story I have a general sense of how big a place my plot/characters are operating in.
To-date I can’t say that I’ve ever had one shrink significantly. If anything they tend to go the other way!