Keep the henna paste on all day. Parts of your henna will crack and flake off during the day...That's ok. :) In about 15 min when the henna is dry enough to touch, Dab lemon-sugar on top of the henna paste. this will help you to keep the paste on as long as possible. tonight before you go to bed, or take a shower, scrape the henna off with your finger. Rub olive oil, (or any oil that you can eat) on the stain before, and after any contact with water. Also, do not put any lotions or sunscreens in the stained area.
The end. :)