How Long does it take Dry Rock to become Live Base Rock and then Premium Live Rock?

How Long does it take Dry Rock to become Live Base Rock.



And how Long does it take Base Rock to become Premium Live Rock?



My LFS sells all 3 - Dry, Base, and Premium



Dry - 2.99 a Pound

Base - 4.99 a Pound

Premium - 9.99 a Pound



I am wondering which of these three to get.



Obviously Premium is much better than Dry.



If it is relatively quick for the Dry Rock to upgrade I will do that to save money.



But if it takes years to upgrade then Dry is not worth it - Same goes for Base.



So I am wondering how long the change takes?