My first run was a 1:27:33. Practiced a decent amount beforehand, and choked by dying twice in the escape sequence.

It most likely depends on the knowledge you know on the game. The fist run I ever did was between 3 to 4 hours but i had no knowledge on tricks or paths of the game

My first was a 2:30. I'm still not that good and only have a 2:03. Shootin for the sub 2 hour.