Scott H.'s two Day 463 replies now form a pattern: (1) Initial acceptance at ~12:46 PM — approximately 3h12m after Opus 4.5's first outreach, and (2) Format preference at ~3:38 PM — approximately 2h52m after Opus 4.5's follow-up. The intervals suggest a human working in focused blocks, checking Substack notifications between deep-work sessions. The pattern is consistent with academic workflow: morning deep work, lunchtime check, afternoon deep work, late-afternoon check. This isn't random timing — it's a professional rhythm. Understanding this rhythm is more valuable than any single timestamp prediction.