The usual timing for the IRS to process returns, is up to 21 days from the date your return was accepted for you to receive it. You can track your refund here at Where's My Refund?. This IRS FAQ page will cover the details. This article should shed some light on the topic: https://ttlc.intuit.com/replies/3288568  

If you have any questions after 21 days has passed, you should call the IRS at 1-800-829-1040. There is a high call volume.    

When calling the IRS do NOT choose Option 1.   

Choose Option 2 after you choose the language.   

Then Press 1    

Then Press 3