We just went to the aquarium 15 days ago on our way to Florida! Loved it! We're from Illinois, North of Chicago, so it isn't easy to visit. We may never go again so we took our time. We were there when it opened at 10; watched several of the feedings and "talks"; saw the dolphin show and their 4-D show; ate lunch and left feeling as we experienced the whole thing by 3:30. We spent A LOT of time watching the Whale Sharks!!! If this was nearer, I could see going several times for shorter periods of time.
We stayed at a hotel on the other side of Olympic Park and walked through the park to get to the aquarium. :-)
I have 3 boys - 14, 12, 7 all who enjoy fish!