With four cats in the house you cannot imagine the amount of time spent cleaning litter boxes. Especially over the winter months. Every morning and night four boxes are scooped and smoothed out. Having rendered one box immaculately sanitary another of the cats will mess it up as you move on to freshen the others.
Living out in the country, summertime is a Godsend as the cats can go out and enjoy the fresh air. Oh yeah, and use the facilities out there, as nature intended.