If you are having 100lbs of LR shipped 2 day, then I would be completely shocked if you do not have a pretty large spike when you add it to your tank, Just start testing the water on day two or three and test it every three days or so you should see the spike in Ammonia and Nitrite, then the lowering of Ammonia and Nitrite and the rise of nitrate, When Ammonia and Nitrite are 0 and nitrate is below 40 and the levels stay that way for at least a week, you are done cycling. Then you will want to do a 25% water change to get levels back in order then you can start slowly stocking your tank.