48 Hours, known for a period of time as 48 Hours Investigates and 48 Hours Mystery, is an American documentary news magazine television show broadcast on CBS. The show has been broadcast on the network since January 19, 1988, in the United States. Reruns of 48 Hours are regularly broadcast on Investigation Discovery, the Oprah Winfrey Network and TLC as part of their daytime and/or weekend schedules, with varying titles based on the edition's subject matter.