I have been using this Loretone tumbler to clean my clad coins for 26 years. The model I have is a dual tub. I estimate that I have cleaned close to 100,00 coins with this model without even changing a belt. Every year I tell myself to buy some spare belts, but I always forget. In the first years if detecting I would clean 5 to 7 thousand coins a year. Since I have aged and have gotten more particular about digging every coins signal I come across, my finds are diminishing. I am hoping that this tumbler will "crap out" about the same time I do!