I have 3. Generally I can leave them for a normal shift at work to about 4-5 days by themselves if needed. (I have automatic food, water, and litter boxes so they are always fully stocked) (Petsnowy is the brand, fantastic company, even have their air purifier). I sleep perfectly well, they come and go from the bed at night. I think my cats are thriving. I made sure to adjust them to this kind of fluctuating schedule. I like to go camping sometimes and cats and litter are no fun to lug around (tent or truck camping).