If you want to complete Morbid in under a hour than you will have to first play on braindead and collect all the loots and suits so it makes it easy for you to complete fast and easy.
Once you have all the ammor equip the level 5 Prototype Suit it increases your agility and running speed. and all you got to do is upgrade your equipment first - grenades, flares - etc and then shotgun and get the blade cannon and then bazooka and then shocker.
Just Sprint Through the levels each level will be complete like 5x faster than the time it sets - i completed undead in exactly 58:23 Minutes