We change the litter daily. We have the type of litter boxes that have 3 levels that you sift (much easier and faster than scooping). When it's time for scrubbing we have a large plastic tub we bought at Home Depot. We fill it with bleach water and soak several litter boxes at one time. Then we rinse with the hose and let air dry. This takes about 15 minutes doing it this way, plus the bleach helps sterilize things. My husband does the litter and I do the feeding.