If anyone wants to know when all the quests expire, this thread will help you.
Here is the list of Quests and their expiration dates:

Adventureland: Expires September 30, 2006

Frontierland & Critter Country: Expires September 30, 2006

Fantasyland: Expires September 30, 2006

Haunted Mansion: Expires December 30, 2006

I got this information from the quests. If you have any questions, please post them here and I will answer them.

-KookyQuack