What I have learned aka "build in the open".

Writing Expressed took 7 months. With AI. A lot of AI. Why so long? This was an adventure to say the least, and with that in mind I posted a blog with an adventure map, you've got everything - a reluctant hero, monsters, side quests, failures and at the end of it all - triumph! no wait - no resolution whatsoever - this is an ongoing story.

https://expressed.effective-flow.com/blog/the-long-campaign/