Body hairs, such as those on the breast, brows, cheeks, and other extremities, do not grow as long as hairs on the head. "The longer a hair is in the anagen phase, the longer it may grow," he explains. Body hairs are able to grow only because they start out as individual fibers that can become tangled up with others of their kind. This causes them to bend toward the earth's magnetic field, which makes them look like they're getting longer. As body hairs grow towards the earth's magnetic field, they will eventually find themselves facing away from it. At this point, they will enter the catagen stage of growth, which is characterized by softening and shedding of the fiber. After three to eight weeks in catagen, the hair will fall out. New hair will then begin its anagen phase and grow back. Since body hairs don't grow very long, you won't need much time to shave or wax them. However, they do grow back quite quickly so there's no need to worry about them stopping forever.