It took all I had to bite my tounge and not blurt out the fact that Jehovah doesn't give a diddly squat if they get their 70 hours or not, because most of it would have been a waste of time driving around and knocking on Not-At-Home doors.
Maybe the next time you have dinner with them it will come out. Nothing wrong with a little honesty. These people are wasting their lives away and trying to get others to do the same.