M*A*S*H first began in 1972. It's last episode, the 251st, was called "Goodbye, Farewell and Amen" and was 2.5 hours long. The last episode aired on Feb 28, 1983. From 1983 until 2010, this episode remained the most watched TV broadcast in American history. It was passed in total viewership by Super Bowl XLIV (2010).