A 15" medicine cabinet was designed to fit between standard 2x4 studs on 16"
centers. The blades dropped into the inter-wall space created by those

2x4s. A quick calculation for a medicine cabinet at 5' high, 15" wide,
3.5"
deep shows a space of some 3150 cubic inches. Assuming the blades
were
about 1" x 2" x 0.005, this gives a blade volume of.01 cubic inches.
You
could drop 315,000 blades into the slot before the space filled up. If
you
changed blades every other day, you had a little over 1700 years of
capacity.

That's assuming that they all fall flat and ended up end to end down at
the bottom of the space right?