Took my DD6 for our first trip in May just before and during Memorial Day weekend. We arrived Wed evening and left Monday morning, so we had 4 full days. We spent the entire time just in DL and CA. The crowds were not up to summer capacity yet so we were able to do and see and ride everything at a very leisurely pace. Many things we did multiple times. If it's your first visit and you are going during the summer months, I would make sure you have at least 3 full days in the Disney parks. From what I am reading of the summer crowds, you will need it. My opinion, the longer in Disney the better. I'm already trying to plan for next year at the same time. Too bad hotels and airlines aren't booking that far in advance.