How long does it take for lice eggs to hatch?

HEAD TO HEAD – How long does it take for lice eggs or nits to hatch?

A head-lice infestation occurs when a female adult louse makes it onto a new head and lays eggs. When those eggs hatch, the lice will most likely stay on that head throughout the entire lice life cycle. Unless the head is treated and all lice and eggs are eradicated, the lice infestation will continue for however long the lice can live (30 -35 days typically)