I would get about 4 shaves before it started taking chunks out of me.
henrys, some people can't use electric shavers, if I try using an electric shaver, and i have tried all the new ones, they barely touch my stubble, by the time i have spent 5 mins trying to cut through it, my face is red raw and very sore.
I don't think you will ever match a good wet shave anyway!!
Yeah about 5-6 is about right for the Gillette Mach 3 i use, unless my wife "accidentally " uses it to do her..... well i don't even want to know what she does with it really!! :o)
I could probably get four or five shaves out of a Mach 3, but I tend to forgo shaving for three or four days at a time because I just don't like doing it. I don;t want a beard, so I have to get to it eventually, it's just a chore.