Long-running TV shows
TV's long-distance runners going strong
Tried-and-tested formulas plus the right amount of novelty have ensured their staying power
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Alison de Souza In Los Angeles, Alison de Souza
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 compared with just 350 or so in 2013.
