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Rating Newest Oldest. Best Answer: Xbox Live time stacks up to 36 months worth. The only times they don't stack is in the cases of trial amounts, like 48-hour cards, or the free month offered to the first 3 new Xbox Live accounts made on a system. Source(s): Personal experience.
You can also redeem your rewards for a nice 5% coupon at the Microsoft Store, discounts on Windows and Windows Phone apps, or even a free month of Xbox Live Gold. Use Bing frequently enough, and you can climb your way up to Silver or Gold status, which confers a 10-percent discount on credit redemptions.