We recommend dividing the hair into 4 sections and combing one
section at a time.  Depending on the number
of nits/bugs in the hair and the thickness/length of hair, it can take approximately
10 minutes per section or longer if necessary.
You need to comb each section until you no longer see any nits or bugs.  We also recommend combing the hair for a
minimum of 5 minutes a day for 7-10 days after treatment to ensure that nothing
has been missed or a new lice infestation hasn't occurred.