hey there, purpose of cycling is to breed the array of useful bacteria, so the more live rocks the better indeed.. but time is also an aspect for the bacteria to make love and populate the large amount of live rocks. and not all live rocks are sold equal, some are more porous than others (the better ones), and some are just less.
tt's y if u visit some LFS u'll notice y some of their filtration system (sump) have an endless amount of live rocks as a filtration medium. some will have bags of Biohome, (really awesome stuff, esp the red 1s), Bioring, Bioballs, some claim Deep Sand Bed (2 camps on this), bio pellet etc.
so if u're a math person, reliable marine water + good bacteria medium (porous live rocs, biohome etc) + good bacteria supplements + time + plenty of patience is the function of cycling.
ah, i might be outdated though, but tt's the basic i reckon! but pls pls pls DON'T put a live fish during cycling period for it to provide food (it's waste) to feed the bacteria, use instead a deshelled prawn! (u will eventually c that the whole prawn rot away into nothing and the water eventually clear up, and tt's bacteria at work!)
btw, some of the live rocks would already have living things on it, so it will also die (from various shocks etc) and rot during this period, but be careful of pest that might survive this period and wreck havoc to ur tank later!
hope it helps! cheers.