If your doctor gets to the root of the problem and the ulcer has been there a short time, might be weeks.
If it's just bandages and the wound has been there for a long time, might be months or years or never. See a vein specialist and get a proper standing ultrasound. If your doctor does not offer chemical or endovenous ablation
, go to one that does. Miamibeachvein.Com or phlebology