It varies, but normally it takes 24-48 hours. Also, the identity-protection safeguards implemented by the IRS in recent years may account for longer wait times. Eventually, you will receive an email letting you know whether or not your return has been accepted or rejected.
TurboTax FAQ "What does Pending mean? "states, "Pending simply means that your e-filed return is on its way and that the government hasn't accepted or rejected it yet.If you e-filed your return in January, it'll stay in Pending status until the IRS starts processing the backlog of returns. After January, e-filed returns generally sit in Pending status for 24-48 hours before coming back as either Accepted or Rejected. Sometimes state returns stay in Pending for several days or even longer.If you contact the government or try to look up your refund status while your return is still pending, don't be surprised if they tell you "no record found." This is normal; until the government starts reviewing and processing your return, they won't have any record of it."
TurboTax FAQ: Why is my state e-file still pending? https://ttlc.intuit.com/questions/1901510-why-is-my-state-e-file-still-pending
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