Search Engine Roundtable reports that Google AdWords Qualified Professionals Valid For Two Years. Many Google AdWords Professionals were not sure whether the seal that they get after meeting the requirements set forth by Google lasts for an year or more.
Google AdWords says that the the qualification expires two years from the date of issue:
Valid exam status for program qualification expires two years (24 months) from the date you passed the Google Advertising Professional Exam. For instance, if you passed the exam on May 1, 2005, your valid exam status expires on May 1, 2007. Those who passed the exam before June 30, 2005 receive an additional 90-day grace period after the original exam expiration date to re-take and pass the exam without losing valid exam status for program qualification.