I winterize and de-winterize in about 15 minutes. Used to do it in 10 minutes but W/D added a few minutes. I winterize and de-winterize on the road any time temp drops below 10 degrees. Having to use anti freeze is for those that think air will freeze. I have a portable air compressor and stop in a rest area and blow out lines. As soon as temp is up again just fill tanks again. piece of cake. Of course in WY air doesn't freeze when it gets 20 below. If a few moisture crystals do freeze it won't cause any problems in the lines. I hate that yucky anti freeze. That is why I buy new MHs. I don't want anything to do with that stuff except in p traps.