Around 13 minutes to beat this section on OLD SCHOOL MODE, the hardest mode, making it the toughest section so far on this difficulty. Having just completed Hard Mode recently I had a good idea of the enemy spawns for the last half of the game. After getting shot in the back multiple times and killed, I decided to play the section very carefully and check for rear spawns every few kills. This made it easy not to get shot in the fuckin back. Aside from this section I've mostly been cruising through this mode with not too many deaths. Spawn memorization is really key and would make sections like this much easier. Its not too hard to improvise in this game by playing some of the harder sections slowly.