Did you say "2" weeks.
Is that the same blade for both face and head?
Yes and yes.
Ouch, I tried using the same blade for my head and face and it tore me up. Now, I use one for the noggin, which lasts about 2 weeks, then a different one for my face which lasts longer than that. I just change blades when I notice the last shave wasn't great.
Do you guys shave with a cream or a gel?