Serial (radio and television) usually ran from Monday through Friday at exactly the same time every day. A show called The Smith Family which ran only one night a week on WENR in Chicago during the early 1930s was credited as the "great-granddaddy of the soap operas" by radio historian Francis Chase, Jr. One of the other shows that helped pioneer the daytime soap opera/serial was "The Guiding Light", which debuted on NBC radio in 1937, and then switched to CBS Television in 1952. "The Guiding Light" final episode aired on September 18, 2009, having a total of 15,762 episodes air on CBS. Some
Soap opera on Britain's behalf in World War II. The BBC continues to broadcast the world's longest-running radio soap, "The Archers", which first aired in May 1950, and has been running nationally since 1951. It is currently broadcast on BBC Radio 4 and continues to attract over five million listeners, or roughly 25% of the radio listening population of the UK at that time of the evening. In the UK, soap operas are one of the most popular genres, with most being broadcast during prime time. Most UK soap operas focus on everyday, working-class communities, influenced by the conventions of the kitchen