swarming is a natural way of expanding for bee's, ever hive will do it sooner or later, queens are different in how big a population a hive will get, I would say on the average a hive will reach about 60 to 75 thousand bee's, some queens will have a hive of 80 thousand or more, some will have less, its all ends up being the queens you have IMHO!!! This is the way I see it, I have done no studies but it sounds like pure common since to me that ever queen is different, some of the other guy's might disagree with me but I have 12 hives and not every hive is equal, I have some hives booming when others are not and when the flow starts some hives are ready and some are behind due to me or something else..... i'm tired of typing, this is something that I could go on about..... ;)