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 Digest had up to 1.4 million subscribers. In 1980, Network Publishing Corporation purchased the magazine from Shapiro, who went on to found "Soap Opera Update". Rupert Murdoch's News Corporation bought the magazine from Gerry M. Ritterman in 1989. Ritterman had owned "Soap Opera Digest" for three years before selling it to Murdoch Magazines; Ritterman earned more than $50 million from his share of the $70 million purchase price. According to Ritterman, he'd purchased the magazine at 750,000 subscribers and sold it at 1.3 million. Murdoch sold Soap Opera Digest to K-III Communications in 1991. K-III was renamed Primedia in 1997, and