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 Network weekday series aired in a daytime slot in 15-minute installments. "The Story of Peter Grey" ran for 164 episodes. The first successful wave of Australian evening television soap operas started in 1967 with "Bellbird", produced by the Australian Broadcasting Corporation. This rural-based serial screened in an early evening slot in 15-minute installments as a lead-in to the evening news. "Bellbird" was a moderate success but built-up a consistent and loyal viewer base, especially in rural areas, and enjoyed a ten-year run. "Motel" (1968) was Australia's first half-hour soap opera; the daytime soap had a short run of 132 episodes.