No head lice do have wings, and do not fly.  They are transferred from head to head contact or thru items like hats, brushes, pillows and anything else which may come in conctact with your head. Lice eggs (nits) take up to 14 days to hatch.  We recommend completing the treatment and do follow up head checks for the next 14 days.  If you find any live lice during that time we recommend completing the treatment again.