Get help from a doctor now âº. It depends: If the skin edges are approximated (e.g. Sutures) it takes about a week. If left open to heal, can take longer depending on how wide the cut is. Once initial wound has covered in skin, takes about 6 months for the scars to mature....Read more. Dr. Keegan Duchicela Board Certified 8 years in practice 15M people helped.et help from a doctor now âº. It depends: If the skin edges are approximated (e.g. Sutures) it takes about a week. If left open to heal, can take longer depending on how wide the cut is. Once initial wound has covered in skin, takes about 6 months for the scars to mature.