Which blade to choose to get more than 3 nice shaves out of it ?
As others will say, YMMV (your mileage may vary). Anywhere between 2-5 would be a good guess.
Depends on the blade and the hair it is shaving. I get about 4 shaves with my Bluebirds. I could go further, but don't see a reason to. Could probably strop them and definitely go further, but hell, they only cost about 10 cents each.
Which blade to choose to get more than 3 nice shaves out of it ?