I've asked a lot of mental ray questions over the past few months but as of late, I'm wondering if I have a serious rendering problem that can only be remedied by starting all over modelling my scene to help rendering times.

The scene I've built is NURBS heavy and I guess one solution I have would be to convert all of my NURBS models to polygons, then reduce those if they're too big. I really don't want to have to remodel the scene because I had a hard enough time as it was building this sucker. So, does scene size affect render times at all? Do NURBS models also affect render times? Any help would be appreciated immensely!

Thanks!
Russell