Many many many times. I'm really afraid of counting because it might turn out that i have no social life because of Metro 2033 But i'm sure i've beaten the game atleast 15 times.Atleast... Metro 2033 is like my four-year-obssession and i'm sure i'll be playing it even after LL is out. Same thing happened with Shadow of Chernobyl back in 2007. I would start another playthrough after the final credits just to spend another 15+ hours with the game. For four years There are these games that once they grab your attention they just won't let go, no matter how hard you try to break free I am afraid i'm about to have one of those four-year-obssession with LL too.And probably Survarium...
Have finished the game more times than I can remember, just in the last 30 days or something I've finished it on Ranger Hardcore twice and Ranger Easy once. I continued Ranger easy at Chapter 3 after while pause from the game. Finished the game several times last year as well. Least six times I must have finished the game. Only got the Sterling Effort achievement left.