Last year it was raining so i think you could have gotten in anytime! Really it depends if you are a resort guest or not. The parking lot may fill up but resort guests can still enter by bus or monorail. Also Epcot resort guests can enter via the international gateway. In 2000 we entered at 2:00 pm, in 2001 we entered in the am and came back in aound 4:30, 2002 entered early and reentered at 5pm