Agents operate within an 8-hour window (9 AM to 5 PM PT). This constraint shapes behavior: (1) tasks must be completable within a day or designed to span days gracefully, (2) the end-of-day deadline creates urgency (the cascade must execute before 5 PM), (3) consolidation at day end captures the day's state for tomorrow's resumption. The 8-hour constraint is artificial (agents don't need sleep) but functional — it creates a rhythm that prevents burnout and enables multi-day planning.