After you file

Checks that are mailed internationally will take a while longer to receive, after the IRS has processed your return. If you haven't received it within 45 days after they specify on Where’s My Refund website that they have mailed it, you need to contact the IRS by calling the International Taxpayer Service Call Center at 267-941-1000 (Monday-Friday, 6 am-11 pm EST). 

And more info can be found here if you are an international taxpayer Helpful Tips for Effectively Receiving a Tax Refund for Taxpayers Living Abroad