So you can film a lot of them in a row. It takes longer than 1 week to produce an episode of a show. So while one director is actually filming one episode, you can have another director already working on the next one coming down the pipe.
The “consistency” is going to be provided by the show runner and their team of writers, sometimes in the form of what’s known as a “bible” that contains important information about the setting, plot, and characters that should remain consistent through the episodes.
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