Is this a world record? The GPT 5.5 ran for 19 hours

The project instructions were so clear that the model didn’t need to ask questions. It would run the tests, write the .md files, and then move on to the next slice. So it was completely natural for it to work for that long.

Give the model clear goals and a solid roadmap. I remember spending around 5–6 hours just creating .md files to build that roadmap.