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in my humble opinion, all the eggs should be set within just a couple days of each other.
being my first time, I too wanted to add more, but only did for one day- so all mine should be hatching within a day of each other.
I understand it that, earlier in development, you turn the eggs to keep them from sticking to the inside of egg wall and make sure all sides are heated equally,
during lockdown, you stop turning the eggs to allow the chick to orient themselves within the egg before making a break for it.
during lockdown, the last couple days, you also want to allow humidity to rise and stay the same. opening the incubator and exposing cooler, drier air to the eggs and chicks will cause membrane to dryout, sometimes trapping chick.
so what should you do,
as someone mentioned, the first chicks to hatch could move the other eggs around, and that is why people use egg cartons.
maybe, put your earlier hatching eggs in one carton during lockdown, put your later hatching eggs in another in the same incubator.
figure out some way to raise and lower one side of the carton for the later hatching eggs over course of their incubation, without opening incubator.
maybe, my coffee also says, you could bring the bator in the bathroom, with a hot shower running if you have to open it for anyreason during lockdown... to keep it humid.
just my thoughts, would not hang from a bridge by it.
anyone else want to add?