president encouraged us to spend no more than 20-30 min in one lesson. That never happened with the "regulars", but it was pretty typical to meet some random person in a village somewhere and teach a 15 min lesson on the BoM or the Plan of Salvation or whatnot on the spot. So 7 lessons in a day was by no means Herculean. I can imagine that in the days of discussions that would be much harder to do.