Sisterlocks are a small type of locs, which are thinner, rope-like strands of hair. Locs are a common protective hairstyle. People create them using methods like interlocking, palm rolling, or braiding. They can also matt, twist, or coil the hair. How long do Sisterlocks last? Like most protective styles, how you care for and maintain your style will affect how long it lasts. Generally speaking though, you will likely need to get your Sisterlocks retightened every six weeks as your hair starts to grow.