How long would it take to tour the whole thing?

I would say close to two hours if you don't stop too often. Three if you read explanations and enjoy the relaxation in the gardens, which are beautiful. You'll enjoy it though. Reasonably priced and a treasure in JAX for sure. 😁

I'd say a good 2-3 hours

My boyfriend and I spent 2 - 3 hours there and we both spent time reading pretty much every plaque and spending a good amount of time in the gardens.

My wife and son spent 3 hours there running around and she wanted to stay longer. Lol #3yearolds

2-3 Hours

Only 40 minutes it used to be at least 2 but they have changed the kid center and there's only 2 things to play with.

3 hours, plus lunch...

I'd give it an hr or 2.