I agree that it looks pretty small for three hens. What are the dimensions? I personally like to have 5sf per chicken of indoor space and 40sf of outdoor/run space per bird but I'm a bit over the top. I make sure to let mine out just before official sunrise when it's becoming light and don't put them back in until sunset. That being said, I also free range mine in our upper three acres for a few hours a day to ensure happiness. They used to get bored and fight a bit before the free ranging started despite having a dozen and a half things to entertain them (climbing structures, roosts, veggie tetherball, etc.). I would worry that they could potentially start having behavior problems when in such close quarters, but at the same time I have 30 so lots more room for attitude.