outside temperature and hatching eggs

[BrotherClucker]

I live in Ohio it's 20 to 30 degrees in the morning , I have 4 black copper maran hens , and a copper maran rooster, my hens lay around 10 am or 11 am. ,my question is after the egg is laid how long do I have before the egg is bad in cold weather?

 

[WalnutHill]

I'm in Michigan...I had some turkey eggs this spring that were frozen but not cracked, they all started incubation though not all made it.