I made this with one prompt using Opus 5.5 I spoke to my computer for 5mins, claude worked for 12 hours, and I woke up to this full prompt:
One prompt drove Claude for a 12-hour build
Using Opus 5.5, a user spoke to their computer for five minutes, Claude then worked for 12 hours, and they woke up to a completed project, showcasing long-running agent execution.