I agree that you can do it all in 3 days. If you get to DL at park opening, then hop over to DCA about 10:30 or 11:00, you'll get a lot done. Be sure to take advantage of Early Entry to do Fantasyland and Tomorrowland, then on regular opening go to the left to do Adventureland, New Orleans Square, Critter Country, and Frontierland. Everytime we entered DCA we sent someone to get fastpasses for Soarin, then we went to ToT and the other attractions in the Hollywood section. Then we were able to work around and get lots done before we were ready for a break about 1:00 - 2:00. We typically headed back out around 5 or 6 in the evenings.