I know this sounds crazy but I change blades once a month, on the first. I use HB triples. In fact, I get a few razor bumps the first time I use a new blade. Usually by the second or third use, no bumps. I am still getting a close shave on day 30. Of course, I am MPB and have very fine hair. I shave in the shower and simply wash the blades with the pressure of the water. Sure saves on blade expense.