I'm thinking this helps. I've been doing this for at least the past two weeks and I've only changed blades once. Of course I didn't write it down when I started so yesterday I put on a new fusion and a new blade on the HB (generic Atra) and stuck a post it inside the medicine cabinet. I'll let you know when I switch again.
I tried this for a couple of days and it didn't work very well for me. I thought it made the little white/blue strip drag on my head. Maybe it's just my head.