The Rev. M. Gregory Gentry of Canton broke the world record for the longest sermon on Nov. 18, 1982, after preaching for 97 hours. The stunt helped raised $10,318.86 — close to $25,000 in today’s dollars — in pledges, which was to go to pay the 5-year-old Canton Cavalry Assembly of God’s mortgage, as well as recruit new members for his church.
Source : Zlati Meyer, “Canton pastor’s sermon starts Sunday, goes 97 hours”, Detroit Free Press, November 18, 2012.