How big do the chickens get?

Most chickens are ready for market when they weigh around 2 kg. It takes 38-40 days for chickens to reach this weight. You may see chickens in other sizes too. A Cornish hen weighs between 1 and 1.1 kg at live weight and is ready for market in 28 days. And a roaster, which is grown in 50 days, weighs about 3 kg.