The frequency of litter changes for cats typically depends on several factors, including the type of litter, the number of cats, the cat's bowel habits, and the size of the litter box. Generally, litter should be changed when it becomes visibly soiled or slippery to ensure the cleanliness of the litter box and the comfort of the cat.

For a single cat, it's generally recommended to change the litter every two weeks, but this also depends on litter usage and the cat's bowel habits. If the litter box is large and the litter is thick, the frequency of changing it can be extended to once a month. For households with multiple cats, more frequent litter changes may be necessary to ensure hygiene.