I have only had my chickens in their coop since Labor Day. My husband laid cement board over the plywood floor, then parged it with flexible concrete. Then, he built three shallow (about 3" deep) plywood boxes that slide beneath the roosting ladder and nest boxes. I filled these boxes with fine pine shavings, then scattered a couple inches of larger pine shavings over the rest of the coop floor. I found a large slotted kitty litter scoop that I use to scoop up the big "plops" from the boxes. I shake the scoop from side to side until most of the fine shavings fall back into the plywood box, then dump the remaining poop into a bucket. It takes about 5 minutes to clean out the boxes, as most of the droppings are concentrated in the box directly beneath the top two rungs of the roost. I use a metal dust pan and a brush or the kitty litter scoop to pick up the droppings from the floor area outside the boxes. My coop is 7'x9' and I have 10 hens and a rooster that free-range most days. Their coop opens into a 100 sq ft enclosure so they spend most of the day outside, with access to the interior.
The coop is well ventilated, and so far, smells of pine. I usually scoop every day, but every once in a while, I skip a day. If I skip a day and the kids have to stay inside all day, I notice a bit of a manure smell when I first open the door, but it clears quickly. I use a 2.5 gallon bucket to collect the droppings. I need to empty the bucket into the compost bin every third day. So far, I've used a 5 cu ft bag of fine shavings and almost one (5 cu ft) bag of coarse shavings. I use the shavings in the nest boxes and on a large shelf, located near the ceiling where three of the girls like to roost and lay their eggs. I scrape and replace the shelf shavings every couple weeks. I've been adding shavings to replace what I remove with the droppings.
I wondered if I needed to completely replace the shavings periodically, but it sounds as though this method will see me through to spring. I plan to completely clean and scrub the coop twice a year. We painted the interior white and coated the concrete floor with some of that epoxy garage floor covering, so I can hose it down. I do plan to spot clean the walls and scrub down the roosting ladder before it gets really cold, but so far, I am pleased with the easy upkeep and very clean eggs.