It is also more cost efficient to continue shooting something once you start. The initial start up costs to hire everyone, build sets, buy props, wardrobe, etc is prohibitive for a 90 minute movie. But if you’ll continue to use those same expensive things over the course of 13 episodes, the “cost per hour of runtime” is significantly lowered.
In modern reality TV, for instance, many productions will shoot multiple seasons back to back to save money.
Source: work in TV production.
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