When are eggs safe to incubate/stops being a 'pullet/new' egg?

Hey all. Kind of a strange question, but I thought I'd ask anyway.

Raspberry (Pekin duck) has been laying for almost 2 months now. I'd like to incubate some of her eggs, but I'm curious when the eggs stop being 'new' or 'pullet' (not sure of the term for newly laying ducks) eggs.

Is it safe to incubate her latest eggs? Should I wait a while longer? Thanks in advance all! ❤️🥚
I incubated eggs less than two months after my pullets started laying and they were six months old. My hatch rate wasn't great but that could be due to the incubator I used! The three that hatched are healthy and beautiful, but these are also chickens so take my two cents for what they are worth.
 
I don't believe the broody instinct has been intentionally "bred out", it's a result of unintentionally not being "bred in" by continous artificial incubation with no thought of the consequences.
Just some evidence of broodiness being bred out of production breeds:
http://www.fao.org/3/i3531e/i3531e07.pdf
https://www.homesteadingwhereyouare.com/2019/06/10/best-broody-hen-breeds/
https://www.scoopfromthecoop.com/broody-hens-101/
https://www.backyardchickens.com/threads/asian-blacks-and-broodiness.1417514/
 

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