How long can the egg stage and immature stages last in human lice?

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human head louse — louse Human head louse (*Pediculus humanus*).

In the human louse, the duration of development is influenced by temperature. The egg stage typically lasts from six to 14 days, while the immature stages—the period from hatching to adulthood—last between eight and 16 days. During this development, the nymph undergoes simple metamorphosis, molting three times before reaching the adult stage.1