Somewhere I've seen figures on actually mileage, but have no idea where. Sorry!
I think that 13 miles from CR466A (current south boundary) to CR42 (north boundary) is very close to reality (via Buena Vista). Much less east-west wide; maybe 6 miles.
Personal examples: my house in Sunset Pointe is 8.5 miles from Mulberry Grove Rec Center at the far northern reaches of TV. I wouldn't even consider trying to take my golf car that far!
But a friend who sometimes attends the same meeting at Mulberry and lives in St. Charles - futher southwest than me - has taken his Street Legal electric there. 40 minutes.
No question! We're BIG!
SWR