2.There is no way it will take you multiple 24 hour sessions. I completed the game first-time-through without a walkthrough in app. 27 hours.
3.Manaan, the water world can be pretty monotonous, especially if you get yourself involved in Sunry's trial, but the rest of the game isn't.
4.No comment. My crappy excuse for a PC will never see KoToR. Another Bioware game (Neverwinter Nights) is what I am playing now.