Let's get this straight: Kingdom Hearts 2 was not a long game as far as the main plot goes. Without paying attention to anything on the side, you could probably go through the game in just over 20 hours. Let's also get this straight: Kingdom Hearts was much shorter (I also beat it in under 20 hours) and had a lot less extra stuff to do. Aside from that, going through and getting everything in the original is a lot less time consuming than completing Jiminy's Journal in KH2.