I woke up one morning to 111 and had tweaked it before bed. I figure it had been high for hours, but that's not to say the interior of the eggs got that hot, remember!! I still had a great hatch.
That was early on in my incubating career, and before I learned that spikes may affect your thermometer, but not last long enough to affect the egg's insides. You may do more damage by touching the thermostat and starting a see-saw effect that could last days than if you actually just opened the lid to let out the heat and watched it to see if it settles down.
It's hard to know, unless you know your incubator.
I wouldn't worry- just keep a close eye on it...but I don't know how high it got.
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