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One to two days as long as the humidity and temp has been kept. You can sometimes help the chick out as long as it doesn't start bleeding. If so stop and try later.

Anytime after the 21 days the developed chicks inside the egg will use their egg tooth to break open the shell in a circle around the inside . Once this is complete the chick will flex its wings and body to separate the shell and emerge from the used egg.

This can take anywhere from 6 hours to a full day. Any eggs left can be kept incubated for about two days to see signs of life or candled. After 23 days the unhatched eggs should be discarded.

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Q: How long does it take for the chicken to break through its shell after the 21 days incubation?
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