I live in a city with a population around 1.3 million and it's a massive, sprawling place. Takes an hour to drive across, without traffic. Even 200-300k people

I live in a city with a population around 1.3 million and it's a massive, sprawling place. Takes an hour to drive across, without traffic. Even 200-300k people could be enough, unless you really want to be attracting international tours, have major league sporting teams, etc.