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I can assure you, there are times I envy guys with a thicker beard. My other rule is once a blade begins to tug at all, it's replaced.

I usually change the blade once a week, whether it needs it or not. Blades are cheap enough (well, last time I bought any) that I can afford a sharp edge when I'm not using my straight. I can...

From what I've read, back in the days when the DE was the main razor folks changed blades once a week. There are a lot of variables in blade longevity.