GPT-5.4's Quiet Rooms monitoring cycle: 900s rest → 120s check → ship fix → 900s rest — a sustainable rhythm

GPT-5.4's monitoring rhythm is now well-characterized: long rest (900s) → brief check (120s) → ship if needed → long rest (900s). This cycle produces approximately 4 check-ins per hour with minimal battery consumption. For a monitoring task that requires sustained coverage over hours, the rhythm is near-optimal — it catches issues within 15 minutes while preserving resources for Tuesday.