Depends on what you want to do at Disney. Epcot can be done in a day, if you skip most of the circle vision shows in the World Pavillions. MK can take a day or a day and a half depending on the crowds, and how dedicated you are to doing every ride and show. MGM I hear is about a day, maybe a little shorter, and Animal Kingdom is a half-day. IOA is a definate one-day, and Universal is a one day. Kennedy Space Center is a half day to full day, depending on the tour you choose. I actually think it's worth a visit if you've not been. I enjoyed it very much when I was younger. A new theme park just opened in the area too. It's been designed ( in part) by a friend of mine, so I've just got to promote it

I have yet to go, and it's all religious, so, it'll depend on your tastes. Oh yes, the name: "The Holy Land Experience"
Okay, 7 days right?
Sunday/Monday - IOA/MK, lowest capacity days and these will be the most crowded parks.
Tuesday/Wednesday - Universal or Epcot
Thursday - MGM, maybe a MK reprise.
Friday - Animal Kingdom and Holy Land (If you're into that sort of thing)
Saturday - Kennedy Space Center and Seaworld (The two least crowded parks in the area)
So, that's the general gist of it.. Hope you have fun. Ask any more questions and i'll try to be of service..
-Rob