I am super impressed with this after even a few days. In past I’ve had to empty quite frequently but with this bad boy he empties himself and it takes me than a day to fill that before I have to dump. It says 45 days but I don’t think in my home with this many animals it will last that long but I’m still good with that. Last one I had to clean it out every time it ran! Was so easy to set up to get started and it works very well!