It says my papers are under review. How long does that take?

[Cowboys71]

I don't know what details.

[CassLO]

The"review" means that your return is pending because IRS is verifying information on your tax return. They may contact you before processing your return.

Please click this link for information directly on the IRS website

Per the IRS website:

Why is my return being reviewed?

We select some returns to examine so we can determine whether income, expenses, and credits are reported correctly. This doesn’t mean you made an error or were dishonest.