You have 10 days from the day it was rejected to mail the return.
"Timely submitted Individual income tax returns and extensions that are rejected are provided 5 calendar days to correct and resubmit the return electronically. April 20, 2019 is the last day to re-transmit rejected timely filed returns and extensions.
If the return cannot be corrected and resubmitted electronically, the return must be paper filed within 10 calendar days of the date the IRS rejected the return. "
https://accountants-community.intuit.com/articles/1839305&src=PSAlert04162019
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