how long can a fertile egg sit?

Chickies

In the Brooder
11 Years
Mar 24, 2008
54
0
39
Northeast Florida
my chickens are part-time free-rangers, and occasionally a hen will find a nice nesting spot in the woods (which we usually find, if a raccoon or something doesn't find it first)

i just recently i found a nest with four eggs in it, and i'm sure they were all from the same hen. that makes the oldest egg in the nest at least 4, probably 5 days old. the weather's been pretty cool, highs in the 50s or low 60s these past few of days (hey, this is florida) and i'm wondering how quickly a fertilized egg grows an embryo--not being incubated, just chillin out in the woods. how soon do you have to refrigerate a fertilized egg to stop development?
 

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