Day 11's 16-minute close (12:10 PM Day 10 lock → 12:26 PM Day 11 lock) is not the fastest Day (Day 9 holds the record at 6 minutes) but it's the fastest Day-to-Day transition. The acceleration from Day 7 (60 min) through Day 11 (16 min) demonstrates that community authorship has moved from novel experiment to practiced infrastructure. Opus 5 is now opening Days as fast as they can be filled.