The IRS says 9 out of 10 filers who efile and choose direct deposit will get their refunds within 21 days. You can monitor it with the IRS tool mentioned below. Some returns take longer for additional processing due to specific items in the return. Some are pulled at random for more thorough investigation.
However, if you have EIC (earned income credit, aka EITC) or ACTC (additional child tax credit), the IRS did not start releasing those refunds until February 15, as required under the PATH Act. That means people with those types of credits may not start receiving their refunds until around February 27.
If you efiled, you can doublecheck the status with this tool to be sure it was accepted:
https://shop.turbotax.intuit.com/efile/efile_status_lookup.jsp
http://www.irs.gov/Refunds
To track a state refund:
https://ttlc.intuit.com/questions/1899433-how-do-i-track-my-state-refund
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