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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.
There are 7 days in a week. 21 days / 5 business days in a week = 4.2 standard weeks. It will take 4.2 weeks (30 days) for you to receive your xbox. It depends on how long they actually take to fix it (it is a maximum of 3 business weeks, it could take less time) wether you will get it back before christmas.