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It should place it in your cart automatically and I believe it's good for an hour.

Price match is only good for about an hour or so. Be careful as it says if you do too many price matches and do not follow through with the transactions that the functionality can be taken away from you.

They are not good for very long, just long enough to complete the purchase. I would avoid doing a price match request unless you are fairly certain you want to buy an item.