It depends.
Are you referring to your tax return refund or your stimulus check?
The IRS refunds can be tracked using the following link:
Where's my refund
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
Also, be aware, the IRS operations are limited during the Covid-19 pandemic. Attached is a link with more information as to what departments are available to contact at the moment.
IRS operations
If your question is in regards to the stimulus payment, please see the following link for more information on how the IRS has been processing the payments.
Stimulus payment frequently asked questions