Unfortunately @TalkALittle hasn't been around for a few years, too bad as they had good advice.
As far as removing poop, there are many variables so there is no hard numbers for durations.
Two things they definitely got wrong on that coop, both door bottoms need to be about 8" above floor.
People door could have a piece of removable wood installed...not sure what you'd do about pop door without making it too short for chook egress.
Poop/Roost boards rock! Here's how I do mine...