How long does it take the IRS to process

The IRS began accepting returns on February 12th. It takes about 21 days for the IRS to issue a refund if there are no additional delays, once the return has been accepted. To get an actual date for when you will receive your refund, please go to IRS.GOV

If you have already checked this website and it says Approved, the IRS says:
"We’ve approved your refund. We are preparing to send your refund to your bank or directly to you in the mail. This status will tell you when we will send the refund to your bank (if you selected the direct deposit option). Please wait 5 days after we’ve sent the refund to check with your bank about your refund since banks vary in how and when they credit funds. (It could take several weeks before you receive a mailed refund check.)" 

Continue to check the IRS website Where's My Refund section. Additional Information