I think it may have been in the mid '80s a new arrangement was started for the 2nd and 4th Saturday of every calendar month. They were designated "magazine days" and the idea was to place as many as possible with 30-60 second presentations. Personally I hated feeling like a magazine seller, I wanted to talk to people.
I think this, and the release of the "Reasoning Book" was the beginning of the end of Jehovah's Witnesses as evangelists.