I think it's matter of whether you're having fun with it or not. I never had a problem with something fun I already paid for lasting longer, especially if I can choose my pace and time to consume those hours of fun. It'd be different if I was chained to the computer playing without sleeping or eating til the game is completed.
I guess I get the concept, since I always get bored of Bethesda games because of how long they are and how redundant combat gets, topped by the fact that dungeons get repopped and as a completionist it annoys the hell out of me that I can't 100% the game, but there's no respawns in games like Pillars of Eternity or Original Sin, so to me it's hard to understand how something that someone hand placed there with their hard work to provide loot, experience and fun can be boring as long as you're getting loot, experience and fun out of it.
Plus honestly, in Original Sin at least for me most fights were over in the first couple turns, just mater of setting up a couple of nice combos.