My sister has this smart vacuum that tries to count rooms and it gets confused if you leave a pair of shoes in the middle of the floor. One time it thought her hallway was a separate living room because the cat knocked over a laundry basket and it created this whole false wall in its mapping. So I imagine with that many people it must be using something way smarter than my sister's little robot. The sensors must be working overtime to separate everyone's movement from the background noise.