I started the integration process a few days ago. The oldest three are 11 weeks old. The youngest 5 are 4 weeks to 9 weeks old. The older 3 hate the newcomers. I have the babies in a wire dog kennel In the coop and I caught the older ones pecking at the babies through the kennel. This is my first flock. I didn't know chickens were so brutal. They are sweet to us and sit in our lap. I'm most worried for my D'Uccle due to her size. At this rate, it looks like I need hubby to build another coop. How long does the integration process usually take?