Four minutes is rather stingy for fifth largest cities. I'd go with at least six.
By that rank, many shift from year to year. There's a bit of trial and error involved unless you're literally looking at the newest list, at which point its not a quiz so much as transcribing.
By that rank, many shift from year to year. There's a bit of trial and error involved unless you're literally looking at the newest list, at which point its not a quiz so much as transcribing.