I sharpen my blades at least twice. Once to be reused to cut fabrics and after they've been sharpened twice, they get used in my other rotary cutter for paper type items. I have all my cutters labeled so no mistake which one is for what. Once they get too dull to cut paper they get put into an old case the blades came in and then finally tossed once its filled with dull blades. So I basically get a good run for my blades.