series Why does a TV series have different directors?

I'm doing research, and I've noticed that, for many TV series, every episode has a different director. I don't know why the producers would do that, so perhaps someone can explain it to me.
 
While the episodes may only take a week to film, they have to do all the pre and post-production stuff. If a single director directed every episode, there's no way they could do 20-something episodes per season, unless it were a live show like SNL.

It's also a good idea because the director would get very sick of doing the show around episode 3, working tirelessly, no breaks. This keeps the show from declining in creativity. Many shows also have different people write the episodes for the same reason.

Not to mention, different directors=different creative approaches.
 
In television the Show Runner and producers are king. Directors
are work for hire. mussonman is correct. The typical hour-long
(not talking about sit-com or live variety) is shot in six days with
three days of prep. So while Director1 is shooting episode 37
Director2 is prepping episode 38 and Director3 is casting guest
stars and under-fives for episode 39.

The overlap allows the producer to keep within the harsh TV schedule.
 
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