Guiding Light (known as The Guiding Light before 1975, or simply GL) is an American daytime television drama that is credited by the Guinness Book of World Records as the longest running drama in television and radio history, running from 1937 until 2009. At the time of its cancellation in 2009, it was the longest-running soap opera in production. It is also among the longest running broadcast programs in history of any kind, across radio media for 15 years, and then television media for 57 years, being first broadcast five days after President Franklin D. Roosevelt's second inauguration. It aired on radio from January 25, 1937, to June 29, 1956, and debuted on CBS Television on June 30, 1952 running for 57 years. The series was expanded from 15 minutes to a half hour in 1968, and then to a full hour on November 7, 1977. - Source: Wikipedia
