on average i'd say 2 a minute, so 120 an hour, a good 6 hour day would be 720.
so 4 days would hit the 3k mark, it does depend on where your delivering though, terraced houses would easily be 6 a minute, where as long drives detached would prob be only 1. maybe an average might be 3 a minute but on a standard semi with car length drive, you'd have to motor.
these are slighlty educated guesses from me so go easy with any disagreements.
derek