I used Feather blades and would change them after each shave. I would use each side twice to get a close shave.

I’m not sure how much you could reuse a single blade. Of course I think it was like $25 for 100.

For comparison, I’ve also used a Mach 3 blade for a month, so the Mach 3 blades lasted longer than a single blade but cost much more $40 for 10.