I think this got discussed last year here, but something interesting happened with my percentage of returned queens. With reasons I won't go into (to long) but anyway I set up 50 mating nucs, about half of the nucs were four for five frames, full of bees, and some brood. The other half were much smaller, with about half a frame of bees to a frame of bees, and little brood. The stronger nucs had 100 percent return! The weaker mating nucs had 30 percent return with mated queens. The weak mating nucs and strong mating nucs were mixed between two different yards, so I know it wasn't the location, the cells were all from the same queen and cell builder. The only difference was the strength of the mating nucs.