Buzz,
Copied verbatim from Travelnet:
"All One Great Team travel must be completed by August 31, 2012."
For additional info concerning the "One Great Passes" or other award travel, they have multiple documents under the "Leisure Travel" tab on Travelnet.
(Not saying you can't come here for info, just giving you further access to what I didn't answer, or didn't post here.)
Fly safe,
GJ