Discovery Cove was an all day experience for us. It's not just the dolphin swim. There is the tropical reef, the stingray lagoon, the bird aviary, lazy river, a nice lunch, pictures and of course shopping or just laying on the beach. It was very cold the day we went and we stayed all day. It was the highlight of our trip. Of course you can just do half day or whatever but I believe park hours are from 9:00 to 5:00??? so you may stay as long as you want as long as the park is open.