You might be wondering how long head lice live off the head. The average louse will live off the head for around 48 hours. However, this doesn’t mean they can’t live off the body. They can survive for a few days off a person’s head and then move onto another person’s head. In fact, adult head lice are known to live for as long as 30 days on the head of an infested person. Moreover, you should also remember that they can survive for only two to three days without a blood meal. So, when you have head lice, the best way to get rid of it is to remove it from your hair.
Most people will not notice an infestation for a few weeks. However, some individuals may notice itchiness in the scalp. This is because the nits that the lice lay are tiny and difficult to detect. Lice eggs need a centimeter of human scalp to incubate.
Lice eggs are white and have a sticky substance that attaches them to the hair. These eggs are often mistaken for dandruff or hair spray droplets. However, if they are properly incubated, they will survive up to a week off the head.