well.. after 9 hours the pre-pass on that huge ibl render was only 30% done.  Am going to downsize it a bit and then re-try it tomorrow.  Too brain-damaged right now to do much.  Only 2 more weeks of this effing algebra class left and then i get to concentrate solely on drafting and my building materials class... both of those are brain-candy so i'll be able to compute some more intense stuff inside the ol brain-housing unit.