Think about it.... The Betas probably run the same amount of time. (Maybe 2-3 weeks?) They get early access. Which also means that their beta will end earlier than ours. So, while they can brag about getting early access, we can brag about it after their beta ends.
Of course, this is all speculation. If the Xbox beta is shorter than the PS beta, you can consider my pre-order cancelled.
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It'll likely end on the same date. I think PS players will get extra time.