It made me laugh because in our congregation back then the territory was huge so publishers only got round it all in about 2 years.
However the people who had specifically asked that JWs do not call, their homes were visited as per the directions every 6 months.
Which meant that the people in general saw a JW about once every 2 years, whereas the people who said they didn't want a Witness to call, got called on 4 times in the same period. Is it any wonder that some of them were quite abusive when their door was knocked.
Go figure.