You should easily be able to get 6-9 months out of a puck.
Hey, this is a place where people write, "I have a baker's dozen of high end silvertips; what brush should I buy next?"
No one here is crazy.
Not even me. I have 250 razor blades and about eight pucks stashed away and today ordered more stuff. Perfectly sane.
Nemo, BSA, nav, you all seem to have reached consensus, and I thank you. Shaving ie has the Fat at a good price, BTW.