Two cats and two jumbo litter boxes. We scoop AM and PM, and empty and bleach them every 4 weeks.

BTW, if someone does a REAL STINKER, shake some of that "Shake and Vac" powder into the box. (Connors nick-name is Stinky-Butt - for VERY good reasons ). The "Shake and Vac" works as well as commercial litter deoderiser, and is half the price for a huge tin.