Real Time is for same-day, ASAP-style ordering: instead of a delivery date you pick a time window from the hours the store has configured for that weekday (e.g. 11am–2pm lunch service). If no time windows are configured for today, the page shows the store's standard "no meals available" message instead of a menu. Real Time items can't be mixed with other modules in the same order — a cart with Real Time items and anything else is blocked from completing checkout until they're placed in separate orders.