How long does it typically take for a day-old chick to hatch?

The typical incubation period for chicken eggs, which includes the time it takes for a day-old chick to completely hatch, is 21 days. This duration is crucial for the development of the embryo inside the egg, allowing the chick to fully develop and prepare for hatching. During this time, a variety of physiological processes take place that are essential for the chick's survival outside the egg. The temperature and humidity levels maintained during incubation play a significant role in ensuring that the eggs develop properly, ultimately leading to a healthy hatch after the 21-day period. This is a well-established standard among poultry producers and avian scientists, reinforcing the importance of the 21-day timeline in egg incubation and chick hatching.