Maxing Out Spells with Warrior/Rogue

[NatNit]

I'm thinking about getting maxed spells on my rogue and warrior, just for bragging rights, and I was thinking about how best to go about it.

The highest magic book each class can read is 212 MAG (although both classes can read higher, it's irrelevant, because over that requirement, all books need 255 MAG).

They can naturally max out three skills (fbolt, heal, heal other) and can get varying levels for the others, with the lowest natural spell level being 4, for teleport (at 181 MAG).

I was wondering how to maximize the effectiveness of Enchanted Shrine runs. Assuming that the cost of books is really a non-issue, and that all spells have an equal chance of dropping (not really true, but eh) then how many average Enchanted Shrines can I expect to find before I have level 15 spells across the board?

I hope that was clear. I have an inkling of how to approach this mathematically, but it's been a while since I took statistics. :D

NatNit

Edit: for clarity