Also shows the lottery of queens produced from queens that have hybrid bees. As the bees in the pic vary from black to mostly yellow, so the queen produced could be any of those colurs, depending on what genetics ended up in the egg she was raised from.
Best I can tell the plug can stay in several hours. The one in the picture is very fresh, but they dry up into a small white thing and fall out eventually. I have never seen the worker bees take any interest in them, you would think the bees would pull the plug out but they don't seem to.