Time at Water Parks?

I’ve never been to any of the water parks but we are planning a visit to one in August (because it will be August) and I was leaning toward Typhoon Lagoon because I like the aesthetic more. Realistically, how much time do you think we (my 2 kids are 6 and 1) need at this park? We are early risers to we can get there when it opens.

We stay 3-4 hours generally.

We usually get to the water park early. We like Typhoon Lagoon, but there is not much shade, so if you get there when the park opens you can bag a good spot. We only stay till lunchtime, especially in August, as it gets extremely hot! And with little ones, you won’t want to stay there too long in the afternoon sun.