Google AdWords Professionals get a seal after meeting the requirements set forth by Google. But how long does their verified seal last for?
There was some confusion if it was a year or two.
According the Google AdWords help the qualification expires two years from the issue date.
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.
If you forget, don't worry, Google explains how you can re-qualify.
To re-qualify at the Individual level, you'll need to have at least one valid exam status listed on your Pro Center page (you must re-take and pass the exam again if you have no valid exams listed), and meet the other requirements for Qualified Individual status. Qualified Companies whose status lapses must employ at least two Qualified Individuals and meet the other Qualified Company requirements to re-qualify for the program.
Forum discussion at WebmasterWorld.