It depends.
The IRS is not processing paper returns at the moment due to Covid-19 and social distancing policies in effect. Therefore, it will take longer to process than it normally would.
IRS operations
Under normal circumstances, the IRS issues a lot of refunds within 21 days, but it could take longer.
IRS processing time and refund status
The online link is your best option to track your refund. I have attached a link with more answers from the IRS as to why your refund may be taking longer to process.
Federal refund questions