How much/long can temperature fluctuate before the eggs drop in their hatchability rate?

BackyardDove

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Long story short, the eggs were kept under good conditions(99.5 degrees w/circulated fan incubator and 30%-45% humidity) for the first couple days of incubation, but then my mom came home yesterday. She isn't the most logical person in the world, so ever since she came home, she's been making the room temperature fluctuate in various ways and not realizing it'll affect the incubator, though I've told her it will. So anyways, the eggs were at 102 degrees for a couple hours last night, and then this morning I found them at 90 degrees. They were at that temperature for at most 7 hours. Have the eggs been damaged? I know that, in nature, momma hen can be off of the nest for a couple hours each day. But since they could've been at 90 for 7 hours, and they had been at 102 degrees for a couple hours the night before, I don't know if damage has been caused by the unstable temperature or by the unstable temperature happening so early into the incubation.
 
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I wouldn't give up on the eggs. It may slow down the development a little but I'm thinking they should be ok
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