2012 Sportsman 800 belt issues

I bought a 2012 sportsman 800 back in 2012 and is absolutely amazing, besides the belt. I do have 28 inch gorilla silverbacks, outlaw mudder clutch, and tons of more upgrades. I have replaced the belt hundreds of times and it kinda ridiculous. I went out riding last weekend and only lasted about 20 mins. Does anyone know what kind of belt I should get to last longer?

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