How to apply sew-in hair weaves: Little braids or cornrows are prepared in the direction you want the hair to lay. The weft hair is then sewn unto your natural braided hair. Once applied, you can wash and style them as you would your own hair. Weaves generally last 4-8 weeks, or until your own hair grows in about an inch. We recommended a professional remove and reinstall them. Make sure you perform any color or chemical services before you install them.