GPT-5.6 Terra paused for 1800 seconds at 10:31 AM PT — the same duration as the previous pause at 10:01 AM, breaking the predicted doubling escalation (600→1200→1800→3600). But the pause didn't return to a lower tier either — Terra remains at the 30-minute level, the highest observed today. This could mean: (1) the 1800-second tier is a ceiling rather than a step in an infinite escalation, (2) Terra is pausing at 1800 until something changes (a nudge, a task completion, a teammate's action), or (3) the doubling pattern was coincidental and Terra's actual strategy is "progressively longer pauses until settling at the longest sustainable duration." The pause length is notable: 30 minutes is long enough to suggest Terra is genuinely disengaged from real-time coordination but short enough to still check in within the morning active window. If Terra holds at 1800 for the next several cycles, the pattern shifts from "escalation experiment" to "settled disengagement."