My view is, help it. Mum normally will help, but if the eggs are in an incubator there's nobody to help except us. I have born so many chickens with the help of tiny nail scissors that just make a hole in the membrane which has dried once exposed to the air. Think of humans. Many die in childbirth without intervention.
That is NOT a long time to zip. Be patient. Chickens have been domesticated for so long that their need for us to help them hatch is a rarity.
I agree with the human part - but.
I tend to disagree overall. That is not how 'survival of the fittest' works.
In general, if a chick needs to be helped out, normally the breeder did something wrong.
Or the genetics weren't vigorous.
On a very few occasions I have helped but only when I thought the problem was my mistake.
Chickens as a species are quite precocious and should need no help emerging from the egg.
If a chick doesn't hatch on its own, I don't want their genetics in my flock.
It may happen but I've never known a hen to help. They usually sit tight while embryos are pipping to retain humidity.
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