I know this is an old post, but I don't see any reason why you couldn't go on forever stropping on Cr Ox forever. CrOx is an abrasive just like a honing stone, except finer. As long an you strop regularly you will remove just enough material from the blade to keep it perfectly sharp. The only way you could go wrong with this method is if don't strop often enough and let the blade go dull, in which case it would take a very long time to resharpen on CrOx, since it is so fine and cuts slowly.