| It really depends on a lot of other factors.Rooms and Corridors generally are usually low polygon - a wall could  just be 2 tris if the whole wall shares the same texture. The level builder in Quill3d is very good at keeping level geometry low poly.
 If you have cut-up the level using CSG for doors and windows then this will also increase the polycount.
 If the rooms contain a lot of static meshes and/or other things like particle generators then this can increase the amount of tris that need to be drawn and will need to be taken into consideration as well.
 I would  say that a level of 6 rooms joined by corridors is a relatively small level but it does depend on just what it contains. If it is pretty much empty with simple geometry then it would be a very small level ( in terms of polygon count) indeed.
 
 
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