How much time should be allowed for the tours, etc? Looks like a few hours?

3.5 hours

We saw all exhibits, shark movie, and dophin show in about three hours, that was with a 1, 3, and 5 year old. But you could spend more time if your company is more patient.

We we're there at least 3 hrs, didn't want to leave, lol

We went with a 1 and 4 yo and spent about 2.5 hours.

We spent 4 hours but went to several of the enrichment talks. 2-3 hours would probably be enough. Really nice place to spend an afternoon.

We usually spend about 3-4 hours there.

I would recommend 2 hours, but that might depend on your level of interest. It is really great and worth the time.

It's self guided unless you pay for one of the extra packages they offer. We spent about 2-3 hours