Sharon, I remember 2-3 years ago accidentally putting a couple of eggs in the frig that I wanted to set. They were in there for 2 days and they still both hatched.
And, for what it's worth, I also had power go out a couple of years ago for 3 days. I had an incubator full of eggs. So I took the trays out, put them inside a sleeping bag, and then all that inside another sleeping bag rated for like 10-15 below. I don't remember if they all hatched but I do remember that a bunch of them did although they were 2 days late if I remember right.
God Bless,