With a cartridge, 3-blade razor, I used to shave every other day and could get about 21 shaves per cartridge (with honing on my jeans). How many shaves can I expect from DE blades? Does it depend on the manufacturer? What's the norm? Telltale signs? (more nicks, etc.)
It varies, but the norm is 3-5 shaves per blade. Some shavers get slightly more, but this would be the average in my opinion. It also depends on your individual bead, some beards are harder on blades than others.