re9 insanity speedrun

im tryna platnium re9, only trophies left to complete are speed demon, blood collector trophy, and complete the game on insanity. i'm tryna do a speedrun on insanity to get the speed demon trophy but i'm 1hr40mins into the game out of 4 hours and i'm at the sniper sequence with leon having to defend grace whilst she gets into the church/chapel(?)

am i on track to finishing the game in under 4 hours? i have infinite ammo btw