I know this has been asked, I may have asked it. But I can't find it. How long can an egg set b/f you incubate it. Sunday my dh brought home some eggs from a friend for me to hatch. They were gathered that day. My incubator is not ready and probably won't be until Sat or Sun, then I still like to run it for at least 12 hrs, preferably a whole day b/f I set eggs. I have been tilting them, but how long can they sit there?