I'm building a house and cutting a lot of trees down on my property with my Poulan chainsaw and it sure seems like I go through the blades fast. I've been buying the Oregon 18" twin pack blades at Home Depot for $32 and it seems like the blade is dull and burning the wood at the end of the first day. Most of the trees are oaks which is a pretty hard wood, but I would think the blades should last longer than that. I know they have files to sharpen blades but after a full day of chain saw work at 55 years old I don't have much energy left to even pick up a file. Does anyone know if other blades will last longer?