If you are sufficiently experienced with marine tank cycling and have good sources for cured live rock (make sure the rock is always submerged and handled like a live animal), then you can do it in less time. The best way is to test your tank water every day to see when it's done cycling. One thing is a sure bet though, if you rush the process, you'll regret it. I've done this enough to know that throwing animals in a tank prematurely will lead to disaster and having to start all over again. It's expensive and a complete waste of time. Take it slow, do it right. Is your tank cycling right now?