This upgrade is not for rush processing. The 5 business day processing stays the same. It is to upgrade to Express 1-Day instead of standard free shipping. Priority express shipping takes 1 business days to arrive. Standard free shipping may take 5-7 business days for arrival.
If you are an international customer wishing to purchase priority express upgrade which takes 5-8 days to arrive after regular processing, you may purchase it under "shipping upgrades."
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