When I was a cub dub, I went to another congo for a meeting one time and they took a 10 minute break after the talk, before the WT study.
I inquired why, and was told they always did so because it allowed publishers who had brought bible studies and "other interested ones" a few minutes to walk them out to the car and chat. That made some sense to me at the time. Only later did I find out that while this had been done away with in most congos, it used to be a common practice. And one reason was so some could go out in back of the hall and grab a smoke. Smoking became a DF'ing offense in '72 or '73, as I recall, and I suspect (altho I was not part of the group then) it was that doctrinal change that led to the demise of the 10 minute break. Discussing all this with an elder one time, his theory was that too many people left during the break so they stopped doing it.
Perhaps some old timers can shed more light.