how do third degree burns heal
+1 vote! Third degree burns usually need hospitalization, it may take 2 weeks to a month for it to heal, and it will also depend on how big your burns are. +1 vote! The healing time for 3rd degree burns can vary depending on each individual's ability to heal, taking care of the burn properly, and the size of the burn. Small burns may take anywhere from one week to a couple of months to fully heal. Larger burns may take several months.