Xenoblade Chronicles is like the never ending game. When I originally bought it without knowing much about it, I figured I'd have beaten it in 20 or so hours. Currently, I'm 75 hours in.
I put more time into Fallout 3, but a good chunk of that was after the main quest ended. With Xenoblade, the majority has probably been actually doing the main quest. Playing through it takes a toll on you, kind of like work.