Henna Tattoos How Long

how long would henna tattoo last?

I am planning to get my boyfriends named "tattooed" in between my fingers. Its going to be real small. I m doing this for our anniversary. How long before my anniversity should i get this done. Also how long would this tattoo last. Is there anything i should buy to make it last longer. Thanx... no smart comment... i will report.... the more defined the answer the better... would be chosen as best answers.

do it 2 days before , so it has time to get dark.
It should last 10 days or so.
Keep the past on overnight, be sure to put it on really clean skin.
Try to avoid excessive washing when you do it also.http://www.hennacaravan.com/
more info here for you on henna