After beating the main story quest in Oblivion, I had put about 55 hours into the game. By the time I got done with the main story quest in the Shivering Isles, I had 85 total playing hours. I'm not even including all the crazy side quests you can do in this new magical world. The quests are fun and the story has a pretty good twist. I would seriously consider this expansion pack if your getting bored with Oblivion at all.
yes: I recommend this product