For those of you who enjoy open-world games, how big of a world is too big?

There are already some huge maps out there, Just Cause 2 and 3 both have maps at around 1000km², and those games are beloved by their players. But if the next Cyberpunk game was announced with Night City now being the size of an actual large metropolis, say like New York, would you say that's too big? What determines what "too big" is?