Eggs can be left out in room temperature (ideal temp is 55-70) for up to 7 days before they're put into an incubator. When you get eggs that are shipped they usually wrap them very well, but sometimes the air cells detach so you have to let the eggs rest for a day or two with the pointy end down. an egg has to be in the perfect condition to create life. You have to have a certain humidity (40-55%) and a certain temperature (99.5-102).
I just put fertile eggs from my flock that were in the refrigerator for 2 days into the incubator and they are actually growing. I just wanted extra eggs to fill the incubator. I don't recommend using refrigerated fertile eggs though.
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