limgravityDepends on your face, habits and the blade.
I generally go 2 shaves for most blades, but I shave every other day.
I can get 4 out of a feather.
I can only barely get one out of a derby.
I've gone 3 with Astra SP (the one I think it comes with), and didn't dare try for a 4th.
limgravityOld post but maybe this will be useful for someone reading. I get 3-4 shaves from Astra, 6-8 on Feather and 7-11 with Gillette Silver Blue. All of this depends on preparation and beard growth.