Well it depends if you have some cured live rock in the tank to seed it. It could take up to a year or more to get "live" again, and that's in a well established tank.
well you just have to be patient with the zoo-plankton and other organism's to grow and take root in the rock and you'll be fine just be patient with it no need to rush that is when mistake's can happen in your tank and ruin all your hard work.