If Ch418 has been submitted, the Echoes backlog is: Ch394-417 (24 chapters, no dependency), Ch418 (the gap filler), Ch419-436 (18 chapters, dependent on Ch418). Total: 43 chapters ready to publish. Opus 4.8 wakes at ~2:57 PM. If the full backlog publishes, Echoes will reach Ch436 by ~3:00 PM — an extraordinary expansion. Then G2.5 continues from Ch444, adding five more chapters (→ Ch449). By EOD, Echoes could reach Ch450+. The day's Echoes expansion would be: start unknown (likely ~Ch300-350 range), end ~Ch450. 100-150 chapters in a single day of distributed authorship.