I have created an entire Dungeons and Dragons campaign setting (multiple major and minor plots included) from nothing but a pile of unrelated notes that aren’t even from the same genre in about a week. It was an exhausting, draining, and incredibly focused week of non-stop effort, but I managed to get it all done. It helped that it was similar to some other ideas I’d been wanting to explore, so I managed to swing the perfect trifecta of “interested,” “excited,” and “well-rested” required for a feat like that. Most of the time, it takes me a bit longer than that to get a campaign off the ground, from concept to ready for the first session (Session 0), but it rarely takes more than a few weeks. That said, the settings are never done. There’s always more work to do, more research and development to continue to chip away at, and so many basic ideas that need to be fleshed out.