amazing  where do i say 1000s of houses mmmm   my street alone has 300 houses allow for units prob 500 for a start , and the postie does all the off streets as well , and a lot of the times you get a letter to the household so everyone gets those,   so a 1000 letters would prob happen on some runs   my street alone 500  and he delivers to more than my street and what about the shopping centre  how many letters do you think the small supermarket gets.