Health Care Know / Helath QAHow Long Does It Take for A Leg Ulcer to Heal? May 23, 2019 - by Walsh J - Leave a Comment Leg ulcers may take three or four months to heal. However, sometimes, they might take even longer, and in a few cases, they not heal at all. In such situations, please consult a doctor immediately. Always keep the ulcer clean to help it heal faster.