Roger, I have no experience with the Fusion ... but the probable answer is it your experience will vary from everyone else's. Also, you may want to try other brands of blades as you feel comfortable doing so.
I ultimately settled on a twin blade (Wilkinson Sword is the brand) and after some adjustment I get about five weeks of daily shaves until I choose to replace it. Probably could go a little bit longer but I'm not a fanatic.
For me, the first six months being sly were all about experimentation and finding what worked for me and what didn't. I think the same will be true for you.