If you get micro braids with human hair your hair will last longer even after washing it regularly. The most popular human hair to use is micro braids wet and wavy, and it comes in many different brands and qualities. Based on your budget you can go the cheaper route or the more costly route which will give you the more premium quality hair. Either way your hair should last with proper care and possible retouches for up to 2 months. I recommend not keeping your braids in longer than that, due to possible thinning edges and hair breakage.