Final answer:
The hair locks in several phases, with the initial growth phase lasting 2 to 7 years. Hair grows at the rate of 0.3 mm per day, and during a full cycle, hair is lost and replaced. This cycle's duration can be estimated to range from a few weeks to a few months, influenced by individual characteristics.
Step-by-step explanation:
The hair locks in several slow phases, which can take a few weeks to a few months depending on the length, density, and coil pattern of the hair. The growth of hair transpires through three main phases: the anagen phase, the catagen phase, and the telogen phase.
During the anagen phase, which lasts from 2 to 7 years, hair grows actively. The next phase is the catagen phase, which is a transition lasting about 2 to 3 weeks. Finally, in the telogen phase, the hair follicle rests, and this period can span 2 to 4 months. After this cycle ends, new hair begins to grow, which in turn pushes out the old hair.
Hair typically grows at a rate of 0.3 mm per day, and on any given day, we may lose and replace around 50 hairs. Factors like hormonal or dietary shifts, aging, or hormonal influence can affect hair loss or growth patterns.