About 45 days. Broilers are chickens weighing more than one kilogram, or chicks that have never laid eggs. Chickens weighing more than a kilo are the fastest, and they should be eaten in 45 days. If it is raised at home, it is enough to raise young chickens for half a year, and it is best to raise old chickens for more than 1 year. Chicken has high protein content, many kinds and high digestibility, which is easy to be absorbed and utilized by human body, and has the functions of strengthening physical strength and keeping fit.