I enjoyed using this henna! It was fine, easy to mix and my designs have lasted well. I used different instructions than the ones sent, but I am very happy with this product. Yes, you need to leave it on a long time, as with all henna that is safe henna, you leave it on as long as you can up to overnight, in order for your design to last. If you take care of it, you can make it last up to 3 weeks! Please read about henna before buying and playing with it. Some have dangerous chemicals. Especially beware of the black henna... make sure you are buying safe products. Read, research, be informed. Beachcombers has lots of information on their site. They do a good job!