Long-running TV shows: How Grey's Anatomy, NCIS and The Walking Dead have thrived

A handful of scripted series on traditional channels are still going strong. PHOTOS: TWENTIETH CENTURY FOX
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LOS ANGELES - The revolving door of "one and done" television shows - the kind that pop up on screen for a single season and are never seen again - does not stop spinning.

This is especially in the era of so-called "peak TV", with more than 530 scripted television shows in the United States alone last year (2019) compared to just 350 or so in 2013.

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