Global operational setting, shared across every price list — not list-specific. Start/end of day (set on Pricing) drive each order's ETA (start of day + tier window for future-day bookings, time received + tier window for same-day); the grid below controls which speed tiers are still offered by the hour an order comes in. Speed-tier names/windows themselves live on Tier Settings.
Which speed tiers are still offered, by the hour an order is received. Narrows toward end of day by default — check or uncheck any cell to override.
Changing start/end of day on Pricing regenerates this grid from the default narrowing rule — recheck any manual overrides afterward. Each column header shows that tier's current window in minutes, from Tier Settings.