Death Valley Days only made 18 years on TV of new episodes being produced (stayed in reruns for 5 more). Gunsmoke owns it for Westerns, and prime time drama. The Simpsons own it for scripted, prime time, animated, and sitcoms. Then there’s various sports and news programs that own the “serious” records.
No. It lasted 18 years on a network and then continued another 5 on syndication.