Final answer:
Hair grows in three phases: anagen, catagen, and telogen. The anagen phase is when hair growth occurs, typically lasting from 2 to 7 years. On average, hair can grow about 6 inches (15 cm) per year.
Step-by-step explanation:
Hair growth occurs in three phases: anagen, catagen, and telogen. During the anagen phase, hair grows at a rate of 0.3 mm per day. This phase typically lasts from 2 to 7 years. The maximum growth of hair with a shaving profile would depend on the individual's anagen phase length, but on average, hair can grow about 6 inches (15 cm) per year.
During the catagen phase, the hair follicle's growth slows down, and the telogen phase is a resting period where no new growth occurs. After the telogen phase, another anagen phase starts, and the hair growth cycle repeats.
It is worth noting that the speed and length of hair growth can vary between individuals due to factors such as genetics, age, hormones, and overall health.