How long does the Roomba j7+ dock last per bag, and why is that better?

The [Roomba j](https://www.amazon.com/s?k=Roomba+j&tag=wehavethat-20)7+ dock lasts 60 days per bag, and because it’s bagged, you don’t get a cloud of dust when you swap it out — worth knowing if you’ve ever cursed a dusty bin.