I only have three chickens so easy to clean out the poo daily from the coop countertops (use latex gloves and toss the poo in a compost pile). The countertops have layers of newspapers and paper towels covered with pine shavings and I replace everything as needed on a daily basis - if soiled or wet, it goes. I also wipe down the roost boards daily. We rake out the coop floor and replace it with fresh shavings every 2-3 weeks. If I had a lot more chickens this approach would not be practical, but with just a few I can have high standards. I never want to walk in the coop and have it smell bad, so I'm motivated to keep it clean. Anywhere between 10-30 minutes a day, depending on the day. During that time, the girls get to free-range and I can keep an eye on them.