I think it depends on what type of lien it is.  Federal Tax Liens are generally good for 10 years.  See 26 U.S. Code § 6502.  But other Federal Liens resulting from civil judgments may be good for 20 years.  See 28 U.S. Code § 3201.  

I can't answer the questions about Pennsylvania's state liens, but state tax liens are different from other state liens in Ohio .

Best,
Robert A. Franco
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