Lily's favorite show is Captain's Cove. Lily watched all 30 episodes last season. Altogether, she spent 15 hours watching it! This season, there will only be 24 episodes.

How many hours will Lily spend watching this season of Captain's Cove?

Since there will only be 24 episodes this season, Lily will spend 15/30 * 24 = <<15/30*24=12>>12 hours watching this season of Captain's Cove. Answer: \boxed{12}.