I got a henna tatoo when I was in PCB, FL a couple years ago. I was told that they used to last 1 month+, but that they've had to weaken the ingrediants (i forget why) and that they only last 1-2 weeks.
Mine lasted a lil over a week, i think. It depends on where you get it and how much that area of your skin gets rubbed.
If you only want it for a few days, then go for it.
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"Delight in excellence is easily confused with snobbery by the ignorant." -Joseph Epstein
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