Waxing lasts approximately six weeks, although re-growth often appears sooner. The amount of time that waxing lasts is determined by the hair's overall growth cycle, the hair growth cycle of the person being waxed, hair breakage and how often the person is waxed.
Hair growth happens in three stages: growing, resting and transitional. Eighty to 90 percent of hair follicles are in the growing phase at any time, while the rest of the hair follicles are either in the resting or transitional phase. This means that hairs growing underneath the skin are too short to be grasped during waxing. These hairs typically appear within days or weeks after the waxing.
Hairs on different parts of the body, including hairs in the same area, often follow different growth cycles. During waxing, some hairs are broken instead of being pulled out completely, allowing the hairs to grow back faster. Hair that is waxed regularly often becomes damaged. This causes the hair to appear finer when it grows back or to not grow back at all.