The frequency with which you need to empty a Roomba vacuum depends on various factors, such as the Roomba model, the size of the dustbin, the level of dirt and debris in your home, and how frequently you run the robot vacuum.
Generally, Roomba models come with different-sized dustbins, and the smaller ones may require more frequent emptying than larger ones. As a rough estimate:
For smaller Roomba models with smaller dustbins, you may need to empty them after each cleaning session or every one to two days, depending on the amount of dirt and pet hair in your home.
Larger Roomba models with larger dustbins can usually go longer between emptying, sometimes up to a week or more, depending on the size of your home and the amount of debris.
If you have pets that shed a lot or if your home has high-traffic areas, you may need to empty the Roomba more frequently. Some newer Roomba models are equipped with "self-emptying" technology, where the robot automatically empties its dustbin into a larger base station. With this feature, you can go even longer without having to manually empty the dustbin.
In any case, it's a good practice to check the Roomba's dustbin before each cleaning session to ensure it has enough space to collect dirt effectively and avoid any issues during operation.