How often do you change your blade cartridge?
Every week on a Monday typically!
I use headblade triples so every three days
I get 2-3 weeks of daily shaving out of an HB4 cartridge.
Every Two Weeks On A Monday with my ATX.
When I use a DE I can get anywhere from five to ten shaves with one razor. If you put a razor in baby oil immediately after using you may be able to get a couple of extra shaves. I soak my DE razor in baby oil and I change it once a month.