A 7 day set it the optimum test bed

But you need at least 2 matching razors to start with IMHO, keeping in mind that the results need to be repeated with at least the major different steels

Solingen, Sheffield, American, Swedish, Japanese

And then after all that, the unfortunate reality is that the results are only for your hands on the hones, and your face under the edge


Can you tell I have done this a few times hehehe