There are no polygon limits, they are restricted by the graphics hardware. (beside the 64k maximum vertices per surface, which is a DirectX7 restriction)
The maximum suggested amount depends on how your game is built. With a clever occlusion strategy, you can get really many vertices in a level without serious consequences.
The maximum suggested amount depends on how your game is built. With a clever occlusion strategy, you can get really many vertices in a level without serious consequences.