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Yeah, I tried that for a bit. Not worth it, IMO. If blades start getting scarce I might change my tune, but they are cheap enough that
I don't ever intend to push any blade to that point again. 3...

+2 re MJC's post.
I find that generally I get 3 shaves from most blades. But there are blades that are only good for one shave for me, and one(Crystal) that I get 6 out of.