Yeah, I kept 3-6 roll back saves at all times too...and thank goodness. I was playing dark side and I had to roll back on Manaan and play nice, as well as near the end of the game, in order to avoid some disasterous consequences.
My finish time, first play through, dark side male soldier, was almost 51 hours. Growing up on Atari and NES, I've never been a fan of lengthy games, but this one really kept me engaged from beginning to end.
I started a new game of KotOR, going to play light side female scout, but I'm taking it at a much slower pace. I did keep a couple of saves from my previous game. I kept the last Ebon Hawk save before departing for the final destination, in case I ever get Live or if OXM ever gets the bonus content. I kept another save right before a critical turning point for a dark side character near the end, and the last one I kept was before the room of the final boss.