Yes 2 days will work, 1 for each park. We spend an entire week, but its not entirely necessary. I would advise you to play it by ear, hopping between parks is no problem since they are very close to each other. Point is, I would scope out the least crowded times for the new Harry Potter area and plan everything around that, it is the new section and is getting huge crowds, but there are times when its down, so I would check into that, do everything else a round that.