Welcome Dr. Dean!
From what you outline, it sounds like you have a good amount of piano experince ‘under your belt’ and you will be able to dive straight into the beginner/intermediate courses.
2-4 hours is a very good amount of time to practice and you will see great results sticking to this everyday.
I’d recommend checking out our practice inspiration section of the forum:
You will see that in the Practice Plan PDF Downloads, we recommend roughly splitting your practice time in half - 50% Theory Drills, and 50% Jazz Standard Study.
The practice plans have been designed for 1 hour practice slots. If you have more time on your hands, simply multiply the designated exercise time by 2, 3, or 4.
It’s important that you try to cover many different theory topics in each practice session, so that you are improving your understanding on a wide range of topics each time you sit down to practice.
The study of jazz standards is where we apply this theory, and also the more enjoyable aspect of learning to play jazz piano, so make sure you are playing the jazz standards!
I hope this helps to give you some initial direction, and if you have any specific questions with the theory topics we are always here to help.