The IRS states that most refunds are issued within 21 days (business days) of a return being e-filed & accepted & you choose direct deposit. It can take longer if the IRS needs to review anything. If you mail in your return it can take 4 to 6 weeks. States differ when they issue refunds.
You can check the status of your Federal refund on the IRS website Where's My Refund
https://www.irs.gov/refunds
If you are getting a state refund you can check your states website
How do I track my state refund?