I never thought I’d but a ‘Smart’ litter box. But my friend has one and I stay in their home and I just love the thing. So when I got myself a cat I had to get her the ScoopFree Self Cleaning Litter Box. Not sure how often it will need to be changed, box recommends 3 weeks on average, but it all depends on the cat. Happy to not have to scoop every day so even two weeks is worth it!!