I'm not sure how long it takes for the pit to drain, but it has never backed up on me. Also, even in the summer, it does not smell bad. Go figure! I haven't looked in the pit in almost a year, so I'm kind of afraid to lift the pool and see what's down there. Honestly though, after lots of trial and error, this method has worked like a charm. I do like the idea of using the duck pool water to water plants and gardens. That is the one drawback of the pit--the water just goes straight into the ground and isn't used for anything else. But we have a well, so I can justify wasting the water. Mmm, duck-well water! I built the ramps myself, and the ramp goes right into the pool, so the ducks can have footing to get out. There are also a few stones around the pool, so the ducks can get in that way. All my ducks learned how to use the ramp, so I'm sure even your not-so-smart one will learn too, lol!