Final answer:
The catagen phase of the hair growth cycle lasts for only 2 to 3 weeks.
Step-by-step explanation:
The catagen phase of the hair growth cycle lasts for only 2 to 3 weeks. It is a brief transitional stage that marks the end of the active growth of the hair follicle. After the catagen phase, the hair enters the telogen phase, during which it rests and no new growth occurs.