I know this has probably been asked a million times, but I am new and could not find the answer, so please answer this one again, thanks. How long can you keep an egg before it has to go into the incubator? I have ordered some eggs and my tray holds 12, but I am receiving extra because of shipping. Can't stand the thought of having to decide which one to ditch, would love to keep them all. But afraid the 21 day wait will be too long. My 'bator will hold more, but then I couldn't use the tray and would have to turn them manually. I am very willing to do this, if needed. So any and all answers will be read, considered, and more than greatly appreciated!!