I'm relatively new to chicken keeping and not an expert but we've been using the DLM since we moved the chicks to the coop and run. I have 6 chickens. The coop is 8' x 9' and the run is 8' x 16' (covered).
Deep Litter how I explain it is 'compost in the making'. In our coop we use pine shavings (with a little DE mixed in for parasite control). We have PDZ on the poop board which I sift-out every day or so. When the chickens poop on the floor, it disappears into the shavings, dries up and decomposes. I have about 6 inches of shavings in the coop (about 2 large bags worth). The chickens keep it stirred/turned but every so often I rake it around from out of the corners, under the nesting boxes and ramp. Only once have I exchanged any shavings out and added a new bag. I dumped them into the run to mix with the grass clippings, straw, dirt and some wood ash from the dust bath out there. Same thing happens in the run, the poop disappears into the litter and decomposes. In the fall I plan to shovel out part of the run and throw it on the garden to sit for the winter. Going to add leaves then as well. There is no odor, no visible poop, no muck and no flies.
Not sure how this would work if my run wasn't covered, maybe someone with experience with than will chime in.