Sorry, Buddy1, you got really unlucky here. There's no chance for you to finish that challenge - GC always closes at noon (plus or minus a few minutes, it's a manual process done by Terry).
The GC-related challenges can only be assigned while the GC is active, unfortunately for you, it was active this morning, so you could get a rare impossible challenge.
(At least it doesn't look like this could affect any badge/let attempts for you).
FunTrivia Editor (Hobbies and Sci/Tech) and Administrator
Guardian of the Tower