As the World Turns (often abbreviated as ATWT) is an American television soap opera that aired on CBS for 54 years from April 2, 1956, to September 17, 2010. Irna Phillips created As the World Turns as a sister show to her other soap opera Guiding Light. With 13,763 hours of cumulative narrative, As the World Turns has the longest total running time of any television show. In terms of continuous run of production, As the World Turns at 54 years holds the fourth-longest run of any daytime network soap opera on American television, surpassed only by General Hospital, Guiding Light, and Days of Our Lives. As the World Turns was produced for its first 43 years in Manhattan and in Brooklyn from 2000 until 2010.