Since the seller has accepted the offer, only the seller can cancel the transaction. You can refer to the below link for more details.
ok it just got canceled and it says " your money has been refunded" is it already in my account
On the average, it will take 5-10 biz days for the redund to show up on your bank ledger balance.
I have yet to hear anyone receving a refund quicker than 4 biz days (does not include Sat/Sun)