Being a history buff, Zeb, I know that you are referring to Edward Everett. In addition to being a U.S. Senator, he also served in Congress as a representative, served as Secretary of State, and was the Vice Presidential candidate for the Constatution Party in 1860.
But your point is well taken. In fact Wilfred Knox, an Anglican priest, once said that an effective sermon should be no longer than 15 minutes. If one goes over that time they lose their audience. And that was always the major problem with JW conventions. I remember the 8 day International conventions of the 1950s and 1960s. After sitting for a couple of days hearing boring talks, your mind went numb for the remaining 6 days and you prayed that the torture would end.