My neighborhood is 1 mile square surrounded by major roads. The same for the 'hood' west of my house. To the north is the next city (Livonia) where the cops give no breaks and to the south is a park patrolled by the county (off limits!!!) In the summertime (at night) I usually cover most of the streets in both areas. I only have to cross 1 major road (4 lanes)
I cover each street once, the longest I've been out is almost 2 hours. This year I will carry the GPS to see how many miles I usually cover in 1 ride.
I'm lucky the streets are smooth concrete and asphalt