I think it's pretty typical for them to have reduced XP requirements in beta right? That way people can push through and see more of the content. I have to imagine there is significant dropout between level 90 and 100 since it's beta and all.
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Seems like 3 weeks will fly by though. Not all of us are going to be playing at midnight rushing to 100. I don't expect to be 100 for about a week after launch; that gives me 2 weeks to gear up, which I'm fine with.