Even if you have a run surrounding your chicken coop, it’s still a good idea to shut them away safely inside their coop at night. The main reason being that it adds an extra layer of security for your girls, as predators could still get inside your run. Nov 20, 2020

Your chickens should have a constant supply of food throughout the day. Chickens will eat when they need it and should go to bed with a full crop as they need lots of food to produce eggs. A fully grown chicken will typically eat about 120 grams of layers pellets a day.

So yes, chickens can stay inside their coop all day as long as they have everything they need for the entire day, including light. If your coop does not have windows you can put in lights and a timer, but that often requires running electric and many people don’t want to do that outside.