How long after you get a henna should you shower?

I got a henna tattoo today, and I’ve had one done before but apparently it was bad because it was gone by the next morning (and my friend’s was too because we got them done together). This one though, is part airbrushed and the outline is a henna. I had it done about 3 or so hours ago. It’s kinda in the stage where it’s like a scab and it has not fallen off yet, though it’s chipping a bit. What I’d like to know is how long before I can shower since I was at the beach and everything and I don’t want to wait until morning to shower.

Thanks in advance!

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