<http://schema.org/description>
"The Inside AdSense blog says Time limit for AdSense referrals earnings is now 180 days.  In that blog entry they source a thread from WebmasterWorld, experiencing disgust the the 90 day short window. "^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/archives/003423.html>