All you need is one square. .....a roll should last a year or more. ....sheryl crow. ....:-}
To be fair, her livelihood depends (or at least she and her handlers believe her livelihood depends) on maintaining a slim figure. She probably eats very little (and is therefor hungry and cranky most of the time!). On that restricted a diet she may well only poop dry concrete pellets once a week. Not much in the way of cleanup needed after that. For her one square may actually suffice...