I think the norm is to add once a week or longer. We have been pretty successful with this theory in my tank. I know one day we bought home three tangs and waited a week and added some coral. I really try to match the LFS with their water parameters and temperature so there is not a big shock after acclimating. There are some bad LFS's out there but the one I deal with is very stringent on when and how we add fish/coral to our tank. As reefers, we get excited and want to add quickly, but they keep that in check and will not sell if too early. They even came out to verify that our tank had cycled and parameters were correct.
Your tank will do it's own thing. Testing the bigs like Calcium, Alkalinity, magnesium, PH, Salinity, Nitrate and nitrites will keep you out of a lot of trouble. I use the RedSea kit to test kit and check once daily on the three bigs. I also have an Apex that keeps track of a lot like temp, PH, water level, and so on. Let me add Ammonia also.
I do add RedSea A and B to our tank nightly so the corals have food and such and in the morning I feed the fish. Good luck!