If you have a child who needs a nap, go when they first open, until they get tired, thats what we had to do. We spent 3 and half hours there, and that wasn't near enough time!!
Just to go thru the whole place would take at least half the day
Spent about an hour as a grown adult and should have given myself another few hours at least. There is a lot to see, plenty to do and explore, and there are many levels. If you have the time, also pay for the rooftop.
Honestly you probably couldn't see it all in a single day. So at least a full day
I love to spend the day there , I would recommend as long as you can because it is not cheap.Also there is no free WiFi because they want parents to be with their kids.
Definitely a full day.
I would plan in at least 5 hours. There are many activities to do and things to discover.
You could stay all day,not even kidding!
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