Do you just want to learn? Or do you want to be excellent at what you do? If you go to a school you can ask the teacher. You'll start off like everyone else. But go to extra classes if you can. Do extra workouts and if your instructor says you have the talent then and only then should you start training like a pro.
FYI in Uechi-ryu to get my brown belt I practiced at least an hour every day and did 3 or 4 classes a week. I cut back a bit for my black belt but trained smarter. I'd say that's the minimum for anyone serious, and for someone trying to be a pro you should be doing things all day (e.g. Training, lifting weights, cardio, studying, etc)
That would be up to your Thai boxer/kickboxer coach, ask him.
If you don't have one, then get one.
I don't know. Why can't you just sign up and go to class like normal people?
Move to Thailand and pay all the way .
How many hours a day and for how many days a week should I train if I want to become a professional thai fighter?