For the budget price of admission, King Oddball actually provides quite a lot of content that would take you several hours to likely be able to work through. Once you add on the levels in the additional modes and the challenge of some of the more unusual achievements you could likely double that time. The question will be whether you’ll want to stick out the ride long enough to enjoy it all. That will ultimately come down to tastes, what you’re looking for, and how you’re planning to play the game. Using it to fill gaps in your day 15 minutes at a time would probably be great, playing for hours at a time probably not so much.