I have logic installed on a power mac and i just got a mac book pro and i want to put logic 9 on it. So i was wondering how many times i can install logic? Because if i can only install it 2 times them my power mac crash's i can reinstall logic.

You can install it on as many machines as you need. However, you're only legally allowed to use it on a desktop and laptop, and cannot actually launch it simultaneously on two machines connected over a network. :) Rounik