They're a source of unfathomable cosmic power. I don't think there's a waiting period.

[Yeah, she has only slightly more of an idea of what she's talking about than he does.]

I...actually was on the version of Knowhere from our universe, right before--

[Just going to assume they're from the same universe because she needs a friend. And not going to discuss Rich because she can't deal with that right now.]

--well. I've been here before. There weren't any Infinity Gems involved.