Three shaves and done, they are so cheap why risk a bad shave. I have pushed some blades further and some have gone in the blade bin after one.
+1 on this. I do two passes per shave. I usually use my blades for 8–15 such shaves. And in my experience, most blades are better on their third or fourth shave than they are on the first.I'm not trying to stretch blade life, I just don't see the point in tossing a blade that is still providing excellent shaves. I actually find that most blades don't hit their stride until the fourth or fifth shave.
I get better shaves using blades longer. In my experience the first few shaves on a blade aren't as comfortable as later shaves...it seems I'm in the minority based on this thread.