How long do you keep mayo in your hair?

If you have lice go to your local store and get real mayonnaise. You will put this in your hair. This will smother the lice bugs, nits, and eggs. Find a plastic bag or shower cap to put over your hair after you put on the mayo in your hair. My doctor said to keep this in for at least six hours. After six hours take a shower and scrub really hard to get the dead bugs, nits, and eggs out. This will also work with olive oil. But, I prefer mayonnaise.