since i have actually helped clean that exact shed i can tell you it doesnt take as long as you would think. but deon pays another guy to come and clean it and pays him in rats...lol.
deon is the one who helped me get my setup up and running. i used the lab trays for about 6 months before i built my rack. now that i have my rack im building another to expand. so so nice. i breed rats though not mice. i agree that the automatic watering on mice racks can and will kill off a whole tub and possibly the one's below it. mice like to clog the valve with shavings and that can cause the sipper to continually run until the reservoir is out of water.
adam jeffery