copious free time (n.): [used ironically to indicate the speaker's lack of the quantity in question] A mythical schedule slot for accomplishing tasks held to be unlikely or impossible. Sometimes used to indicate that the speaker is interested in accomplishing the task, but believes that the opportunity will not arise. "I'll implement the automatic layout stuff in my copious free time."
(It's a bit less cool when I have to admit that it was a free gig anyway. But we got to use a separate entrance. Or at least we would have done if we'd known it was there.)