On my Hotpoint WML540 Super Wash adds time on to the main wash and raises the water level almost on to the door glass. The water is also heated to the selected temperature twice and if 60 is used then it is extended to 3 hours.
Mini load shortens my washes, interim spins and the final spin stay the same however during rinsing mine will cut out the slow tumbles and low water level section meaning each rinse starts with fast tumbles and a medium water level rather than high.