Orlando Disney World is the largest in the world. Since Disney World is divided into 4 parks, the size of each park is smaller than you might think. (If you are diligent, you can easily see everything in one day.) However, when purchasing tickets, the price difference between 4-day and 5-day passes is not that big, so I recommend choosing the 5-day pass. (Average of 20,000 won?, excluding spacial offers)