21 days is the 'norm' but they can hatch sooner or later by a few days depending on temps throughout incubation.
Coconut oil or anti-biotic ointment is good for moistening drying membranes.
Water just dries out too fast.
Here are my go to's for hatching info:
https://www.backyardchickens.com/ar...incubator-thermometers-and-hygrometers.73634/
https://www.backyardchickens.com/articles/the-beginners-guide-to-incubation.73350/
https://www.backyardchickens.com/articles/guide-to-assisted-hatching-for-all-poultry.72886/
https://www.backyardchickens.com/articles/incubation-humidity.73386/
Coconut oil or anti-biotic ointment is good for moistening drying membranes.
Water just dries out too fast.
Here are my go to's for hatching info:
https://www.backyardchickens.com/ar...incubator-thermometers-and-hygrometers.73634/
https://www.backyardchickens.com/articles/the-beginners-guide-to-incubation.73350/
https://www.backyardchickens.com/articles/guide-to-assisted-hatching-for-all-poultry.72886/
https://www.backyardchickens.com/articles/incubation-humidity.73386/