RSD was first in my right leg ankle foot. then moved to let then complete lower part of body .now is left hand as well. 20 minutes sounds about right. and my swelling is constant, but gets worse at night. ready to cringe. the only thing that helps swelling is compression stockings. (owww) and most recently I have been squeezing my swelling manually. raising leg doesn't work nor warm water or warm dry air.. but i put myself through hell to try and reduce the swelling. the swelling is starting to harden with scares me.