How Long Should You Wait In Between Getting Tattoos?

I just got my first tattoo on 5/31 (Saturday), a black cross with silver inside on my upper left arm. I want to get a Viagra whithout prescription tribal band of some sort on my right arm but I was wondering how long I should/have to wait before getting more ink done? I definitely have the bug and wanted to get the second on sunday, but didn't have the money yet.

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