MyNetworkTV originally started as a conventional network with a format primarily consisting of English language telenovelas; however, after experiencing continued low ratings for its prime time - exclusive schedule (even after several programming revamps that followed over the next three years after the initial format faltered), it converted into a "broadcast syndication service '' in September 2009, adopting a format made up of reruns of series originally aired on other networks for ten hours a week on Monday through Fridays. Ion broadcasts 24 hours a day, seven days a week (though only eighteen hours of its schedule each day consist of entertainment programming, with infomercials and religious programming making up the remainder of the schedule), making the Ion network the largest English - language commercial television network to be totally responsible for its affiliates ' programming. Ion differs from other commercial networks in that the majority of its stations are owned - and - operated by its parent company with very few affiliates, and it is distributed exclusively via cable and satellite in markets where the network does not have a local station; Ion was the last of the seven conventional English language commercial broadcast networks to expand into distribution via digital multicasting, having relied entirely on cable and satellite distribution in markets where it otherwise could not maintain a primary affiliation until 2014, when it began accepting subchannel - only affiliates through deals with Telemundo Station Group and Media General.
when did television started broadcasting 24 hours a day
September 2009