John, I’m glad you’re getting that much life out of your blades. You must be “doing it” right! However, in high production sawing as in commercial applications, blades may only last 2-3 weeks, depending on the materials being worked.. I have the same blades as Jack. I've been using them in my shop(with everyday usage and do higher production than you may?) and usually resupply my inventory about every 3 weeks. I get my blades at 30% off regular retail at www.sawblade.com. They are out of Houston