Page is a not externally linkable
-- Google AdSense
---- Adsense: how many ad units per page work for you?
netmeg - 2:20 pm on May 9, 2012 (gmt 0)Thread source:: http://www.webmasterworld.com/google_adsense/4450238.htm
I don't think there's anything in writing anywhere, but I seem to remember it in terms of "millions of pageviews per month" that I once heard from someone who was a premium publisher.
Brought to you by WebmasterWorld: http://www.webmasterworld.com