I've just created a maze of size 60x60, which contains about 49.000 triangles (according to TrisRendered), so the upper limit per surface must be around 65.000 tris, because when I create a maze of size 62x62, it crashes.
I don't know how many vertexes there are (I'm not going to count them manually).
I don't know how many vertexes there are (I'm not going to count them manually).