You could spend over an hour for sure, (but if you needed it to be quick you could zoom through in 30 minutes too). I think we spent at least an hour, (though it's been about 1.5 years since we last visited). There are things to touch at the beginning, things to watch all throughout, and a few things to do and to buy at the end.
As fast or as slow as you want
I used to go and dive with the sharks which was a complete package and took 4+ hours, they still have the snorkeling which would be 2+, the behind the scenes is easily 2 and just walking through is 30min+. It all depends on how quickly yoi choose to go
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