Importing models from other formats isn't in my realm of knowledge as I don't do it. The maximum number of vertices you can have is 65,535. The maximum number of faces is just short of 4.3 billion (theoretically). You need to keep your vertex count less than 65,535.
"You level up the fastest and easiest if you do things at your own level and no higher or lower" - useful tip
My 2D game - release on Jun 13th; My tutorials
