This is the scheduled clock time (HH:MM) on Tuesday at which load bank 1, previously shed earlier that day by disconnect1LoadShedTuesdayOff, is scheduled to reconnect, per the description. Pairing this reconnect time with disconnect1LoadShedTuesdayOff defines bank 1's full shed window for Tuesday; since bank 1 is usually the least critical tier, its window is often the longest of the three banks. A value of '06:00' paired with an Off time of '22:30' on the same Tuesday defines that day's full overnight shed window for bank 1; if the On time were set earlier than the Off time, that day's schedule would effectively do nothing.