I love this self cleaning litter pan, it’s easy to set up in less than a minute, just put the litter tray (1 included) underneath, plug it into any standard outlet and it’s ready to use.  Stays clean and fresh for weeks, but this also depends on how many cats you have.  The cleaning cycle starts about 20 minutes after it senses your cat has left the box, and then just replace the tray when you are ready.  Truly is a lifesaver.