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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.
The same is true for 1 month Xbox Live, Microsoft charge Â£5.99 in the UK but, you can buy codes for around Â£4 from eBay, or websites that provide codes (legitimate sites! eg CDKeys in the UK is a good reliable site)