Question: how long does it take for lice to appear?
Answer: It attaches itself firmly to an individual hair strand close to the scalp. After 7 to 10 days, the nit hatches and becomes what is known as a nymph, or a young louse. Nymphs are usually between 1.1 and 1.3 millimeters, and tan or white in color. Nymphs mature into adult lice within about 9 to 12 days.