It would depend on several factors.
Blade selection
Beard hair type
Razor selection
Prep prior to Shaveing. In any case l never push it push it beyond 3 shaves on my blades costs are still way low.
I am the resident blade ruiner, it is one three-pass shave and out or I get really severe irritation and weepers. I did get a second shave out of a sample Perma-Sharp, but that is unusual for me. Next month I think I will purchase some Perma-Sharps to see if two shaves is the rule for that blade or if it was just a one-time aberration.
I replace my Feather blades once a week. I shave every weekday and then late Saturday afternoon, making it six shaves in a week. When I used Derby blades, I was lucky to get three shaves out of them. I take good care of the blades. After each shave, I use an old toothbrush to clean the blade. The blade is turned after each shave and after shaking off any excess water, I did the head of the razor into 91% alcohol (the alcohol is also changed once a week).