Conversation so far:
what were some of Ed McMahon's other roles?
Since 1973, Ed McMahon served as co-host of the long-running live annual Labor Day weekend event of the Jerry Lewis MDA Telethon.
where was the live annual Labor Day weekend event of the Jerry Lewis MDA Telethon with Ed McMahon?

Question: how many years was he a part of the event?
Self-contained rewrite: how many years wasEd McMahon a part of the the live annual Labor Day weekend event of the Jerry Lewis MDA Telethon?