How long do people who have Bulletstorm epic edition get the Gears Of War Beta for?

"Enlist in the most explosive gaming event of the spring: the Gears of War 3 Multiplayer Beta! Get into the Beta by preordering Gears of War 3 through select retailers. The Beta begins April 25 and ends May 15. For those of you who purchased the Bulletstorm Epic Edition (on Xbox 360 only), you get early access to the Beta, beginning April 18. This is your chance to help shape the most anticipated game of 2011. Find more beta details and the selected pre-order retailer in your region after the jump!"