...not miles, triangles.
There is that great wiki page written 22 months ago: https://trac.wildfiregames.com/wiki/ArtPolyCountGuidelines#PolygonCountLimits with recommendations and a link to one artist (a great one) tips.
Here are them:
Type of object
Max triangle count
Humanoid bodies
1000
Humanoid props
100
Building props
200
World props
200
Small animal bo