I wore a knee brace (tight) all night to help knee pain and this morning my ankle and calf are all swollen (pitting). How long till it goes away?

Hours. Remove the brace and elevate the leg. I would expect the swelling related to the brace to resolve within 4-8 hours. When re-applying the brace, make sure it is not too tight as this will increase the risk of swelling beyond the brace. .