it can take anywhere from a week to 6 weeks to fully cycle a tank. Being that you added already cured live rock it should only take between 2-4 weeks i would suspect. BUT you must not have ANY ammonia or nitrites and PH should be in the normal range before you add anything. Fish can die suddenly when added to a tank that has not fully cycled. PATIENCE is best when it comes to adding things to a new tank. The good bacteria that accumilates goes under sudden shock when you add alot of bio-load at one time.