This is the scheduled clock time (HH:MM) on Sunday at which load bank 2, previously shed earlier that day by disconnect2LoadShedSundayOff, is scheduled to reconnect, per the description. Pairing this reconnect time with disconnect2LoadShedSundayOff defines bank 2's full shed window for Sunday, which as the middle-priority tier is typically shorter than bank 1's window but longer than bank 3's. A value of '07:00' paired with an Off time of '20:00' on the same Sunday defines that day's full overnight shed window for bank 2; if the On time were set earlier than the Off time, that day's schedule would effectively do nothing.