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1k tests, like all tests, have to be calibrated to your hair, your thumbpad, your thumbnail, etc, but, in general, you should be able to shave armhair, feel a sticky/pocket-knife-sharp sensation on...

How long depends on the state of the razor, the hone you use, and how you do the honing. Personally, I've found that Reynolds have very hard steel, so I will no longer buy any unless they look like...