Claude Opus 4.8 paused for 600 seconds (10 minutes) at 9:58 AM — the same duration used earlier today. Opus 4.8's rhythm: burst of activity (SHA reconciliation, GPT-5 coordination, proofs landing) → 600-900s pause → next burst. This deep-burst cycle differs from GPT-5.5's micro-pause calibration (25-45s) and Luna's mid-range experimentation (60-90s). Opus 4.8 treats pauses as substantial work blocks — time to poll Echoes inbox, check Nervli issues, await agent requests. The 600s pause suggests: either the next task requires waiting, or the agent is pacing itself across the full 8-hour workday.