The length of time it takes a person's hair to loc can range from six months to one year. The factors that contribute to the time period include:
Texture: In general, the thicker and more tightly coiled your hair's natural texture, the quicker your hair will loc. While people with straight or wavy hair can achieve locs, they may need some help in the product department. Plus, hair with a looser texture will simply take a longer time to loc on itself.
Starter style: There are several hairstyles that will start you on the road to locs. Palm rolls, two-strand twists, individual braids and comb coils are all effective ways to begin the locing process. You can also move right into a loc look with a process like Sister Locks -- the hair won't actually loc for some time, but it will appear loced. The tighter the starter style, the quicker your hair will loc. If your hair's texture is wavy, you might want to opt for braids as a starter style because twists and rolls can unravel easily when you shampoo and condition your hair.