Although the typical return takes 21 days to process it sometimes can take longer. This is normal. More information has been provided below as well as a source so you can track and get an update on your return.
https://ttlc.intuit.com/community/refund-status/help/what-if-my-irs-refund-is-taking-longer-than-21-days/00/26080
https://turbotax.intuit.com/tax-tools/wheres-my-refund/