I finished this in 20 minutes.
Then again, I played this one a LOT in my SNES days. Muscle memory is still pretty much intact, so I could deal with the stages and bosses in the quickest way possible.
Quite honestly, this game is a blast! (No pun intended). There's a lot to do with 2 Players in this. Matter of fact, the story mode almost forces you to have a friend or family member alongside you, so you can get the bonus points and upgrades.