14 days - just back up your system and Apple will take that back and send you out a new one with the discount refunded.
Happened to me a few years ago on the black MacBook.
Or, try calling Apple Customer Service and ask them for a refund, unless you desperately want the .1 GHZ of speed bump. I just call Apple got a $500 refund on a i7/8/512GB that I bought from the Refurb store. Was already to back it up and send it back and rebuy. No need to now.