That’s why you often end up with ‘cities within a city’ (ala wards, boroughs, districts, etc) and in those cases it’s easier to mentally model the overall city more like a small state.

If you’re sensitive to commute time, you’ll want to live in the same ‘city’ as you work, for instance, or at least nearby. But it will cost you a lot of money, and you’ll get a closet.

If you want the ‘big house with a lawn’ experience, you’ll pick a distant ‘city’ or even another ‘state’ (in this case, a city in a nearby suburb).

Typical case, it’s an hour+ end to end from one side to the other even on the fastest transit for Tokyo or London, and they have really good transit systems.

Singapore similar when it’s busy (which is actually quite a feat considering how small of an island it is).

It’s been awhile since I’ve been in Manhattan, but I remember it being roughly 1-2 hrs too.

Mega cities like Mumbai? Double that.