How long do head lice generally live?

Head Lice. The life span of an adult louse on a host ranges up to 30 days. During this time, the female head louse can deposit about 90 eggs. After incubating for seven to 10 days, the nits hatch and, after another 10 days, mature into adult head lice and the cycle begins again. Off the host, adult head lice can live about two to four days at 74 degrees fahrenheit (f) and one to two days at 86 degrees.
1-2 days off host. Head lice cannot survive for more than a day or two without a blood meal.

Related Questions

Can an infection by head lice be healed naturally? If yes, then how long will it take.

Unlikely . One can attempt manual removal but unless done on a daily basis it will be really hard to get rid of it. Over the counter products such as NIX (permethrin) along with combing will be the best way to get rid of Head lice. Make sure you wash the linens and sheets in hot water as well. . Read more...
Define natural ???? Some have offered experience that a stout vinegar, like pickling vinegar can be used as a wash over several days to a week and do this.The acidic solution does loosen the nits/egg casings so they can be removed easily with a nit comb.If this did not work one of the OTC or prescription products could be used. Read more...