I was aiming for another amazon card recently and it took me exactly a month to earn 7,000 more Xper.
The first redemption was 3/17 and the second was 4/17
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I felt stupid by how I understood the redeeming points. Though you loosed over all points but apparently you don't. So I've been spending it each change I get which gag ended up letting me redeem 3 times within a month. :D
I have no idea if I can get 7k within a week, never checked to see.1