thats a tough question never timed how long they last, tbh you used to be able to get endurance brushes which were good for 24hour races and such but where you would pick some up i dont know i may have some but cannot promise anything, normal brushes were rated by how many runs you could do some of the high performance were 2-3 packs then needed change so around 15minutes for those others were 10-20 packs you get the idea you want hard brushes which wont wear out fast, obviously the comm will still need to be cut though or that will cause wear as well hth
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