How serious do I have to be about singing to take your course? I’m not sure I want to make this my career, but I do want to sing better!
The KTVA method is designed specifically to make your be the very best singer you can be, there is no better vocal coaching available anywhere, period! And it requires you to really want it and to apply yourself. How long it takes you is completely up to you.
The other thing is this, once you use the KTVA method, you will WANT to sing more, because you will be so much better than before and you will get much more satisfaction out of singing, I guarantee it!