I’d say probably no less than a thousand. I do have something that would make it easier. If you want, you can cut off pretty much 1/3 of the map if you only make a certain part. Here’s a link to that map:
https://www.gamewatcher.com/news/2017-17-08-here-s-where-total-war-warhammer-3-will-be-set-and-what-races-we-can-expectJust ignore everything in the purple box, and make what’s in the red and blue.
Edited 4/21/2018 22:17:21