Per the IRS article below: " You incorrectly enter an account or routing number and the number passes the validation check, but your designated financial institution rejects and returns the deposit to the IRS. The IRS will issue a paper check for the amount of that deposit once it is received."
There is no specific time frame listed by the IRS, however the refund would need to go back to the IRS and a check would then be issued. Typically it is mailed out via USPS and arrive within 7-10 business days.
Please check out the below links for more information and assistance:
Frequently Asked Questions Refund Inquiries 18
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