I heard the eggs are vital for a max of 3 weeks but after the first week you will have more failures.I have a hen that has decided she wants to sit on eggs today. I got 2 eggs from under her because I want to wait a few days until I let her sit. My question is: She has been on these 2 eggs today, not sure exactly how long but I collect in the evenings. Have these eggs already started developing? Will they be okay to put under her next week?
this byc thread addresses it very well. The Broody Magician has a surprise for you.
https://www.backyardchickens.com/t/...ile-eggs-viable-before-they-start-to-incubate
It depends how they are stored. 65 F and 60% humidity is what he says I think it was.