Oh, I see that now. Thank you. I forgot to change my settings back. Do you know how long it can take?
can take as long as 3 days depending on your luck. the bitcoins will return to your wallet if the tx still doesn't get confirmed after 3 days.
though you can double spend the transaction after 24~ hours. but you'll have to import the private key of that address to a different wallet and create a new transaction from there.
Nothing prevent him from double spend them now, if he want to.