A:Answer It depends on a ton of factors; the composition of the walls in between the satellites, how many levels and composition of floors, which mesh system you buy, etc.
I used a 2 point system and had super fast connection around the house of about that size. I recently upgraded to a 3 point system (router + 2 satellites) to hit some spots that were lagging on video calls but I think it's overkill. With the 2 point system the kids had WiFi at the treehouse and our fire pit so it's definitely a lot.