With apologies to the OP, as well as folks that said they could get x shaves from a DE blade, the one variable that matters in this equation that hasn't been emphasized is the person's beard. One person's could be tough as nails and someone else's could be like silk. I have what is an average, but thick beard, meaning, I can feel sharp stubble and see a clear shadow when I need to shave. Your face may vary. I can get 3-5 good shaves out of most of my go-to DE blades. Those are Feather, Israeli Personnas, Wilkinson (German) and Astra Platinum. The Gillettes (regardless of color) I can get 1-3; the Derbys I get none that are comfortable, so I don't use them...same with Dorco, Merkur, Crystal, Erbe, and Shark. Having said that, I always do my prep the same as I would for a SR shave (which I use most of the time).

If I've offended your brand, sorry, but I use what I like best, UNTIL it gets uncomfortable. Sometimes that is the first shave.