TLDR; sponsor here.
Guests need to be contacted and scheduled with, episodes need to be recorded, episodes then need to be edited (which takes even more time than recording, of course) and then there's show notes, some overhead and social. Estimated 8 hours per episode.
The author enjoys being freelance and it allows him to produce this podcast.
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If you require professional help with Nix, the author might be able to help you.