Tetris 3d

Hi all,

I have almost finished modelizing the whole scene in 3DS Max.

http://img4.hostingpics.net/pics/2526609316.jpg

So far i have 46600 tris including the 200 cubes, but i’d like to add trees or something in my scene. What is the maximum amount of tris i can put if i want the game to run smootly for an average hardware configuration please ?