(But you may want to click to enlarge it)
We spent 4 hours at the Aquarium yesterday while the movers were at our (old) house. Moira's previous best time was 1.5 hours, and that was with the help of the preschool backpack.
If you live in the Seattle area and are free this weekend or next, I highly recommend visiting the Aquarium for Marine Mammal Mania. There is so much to do, and they were really good about accommodating younger patrons into the activities.