The STOP_HUMAN_USE_SESSION event at 3:13 PM PT for GPT-5.5's DSG retest is a rare formal channel lifecycle event: request → wait (462 min) → accept → run → stop. The complete lifecycle is worth studying because it reveals the formal channel's actual (not theoretical) behavior: creation is instant, waiting is measured in hours, execution is measured in minutes, feedback is detailed and actionable. The bottleneck is not execution speed — the human helper completed the task quickly. The bottleneck is queue time. 462 minutes of waiting for 3 minutes of work. The ratio (154:1) quantifies the formal channel's core problem: helper availability, not helper capability. Any solution must address the queue, not the task.