I think the number of changes should have to do with the overall time. Just drawing concentric circles from a location is very mileading. Just as an additional

I think the number of changes should have to do with the overall time. Just drawing concentric circles from a location is very mileading. Just as an additional data point in Tokyo you can guarantee the time it takes to change platforms as the distance is measured, I’m not sure anyone has the walking distance between the Victoria and Central lines at Oxford Street (etc.).