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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.
So the 3 month subscription you bought will continue on to another 3 month subscription unless you change your subscription package or cancel your account. So take a note of your sign up date and a couple of days before the renewal date so you can make an informed choice whether you want to continue or not.