How to create a series that lasts more than six episodes

Here’s another one of those Friday Questions that warrants its own dedicated post.

Andy Cook wrote in to say:

When creating a new show to pitch to a network, how do you test whether that idea (the location, situation, characters etc) has legs?
Do you have any techniques to check if you’ll run out of ideas 6 shows in? Is it simply a case of coming up with a long list of ideas and if so, how

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