I've heard 2 weeks so far, and the Halo Reach beta lasted longer than that(17 days wasn't that long, but I'm hoping this Beta will be at least a month's worth), so I'm expecting up till the beginning of August or halfway through August myself. The Beta Date update doesn't say how long it lasts either, I need confirmation.
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Edited by PandaJerk007: 6/28/2014 5:31:25 AMI'd also like to know the answer! A month would be great but that kinda seems too good to be true, though I don't think anything has been confirmed, so I guess you never know.