Vacuum robots are usually designed for apartments and cover at least 60 square meters (m²). There are many models that reach more than 100 m². For large, usually industrial spaces, the robot covers between 300 and 500 m². The surface covering the device is important.
We should take into account some additional aspects:
The longer the battery lasts, the more surface the robot can cover.
If the model is very tall, the robot will not be able to clean under chairs and sofas.
Therefore, consider the height of the device and the measurements of your furniture.