How long does it take to get through these courses assuming I am a quick learner and spend about 20 hours a week.

It depends how much do you already know. I have personally skipped almost all the initial videos on Javascript, PHP and Python because I m already familiar with variables, loops, conditions and the basic syntax for writing code in these languages. Since you are new to coding I guess you will need to spend some time to grasp these concepts. Once you get the concept of, for example, a variable in one language you only need to learn how you define it in another (since the concept of a variable is basically the same for all languages).

Plus some lectures in one track tend repeat some concepts already explained in another (ex Web design and Front End Development).

Thanks for the reply. I am as beginner as they come, however, concepts do not seem hard from what I have seen. Im hoping to grasp the basic concepts in a few months. Ill be spending a significant amount of time doing this. Anywhere from 3-4 hours a day 7 days a week.

It is doable. The best advice that I can give is to play with the code after the lessons (changing in a bit here and there) so that you can fully understand how that piece of code works.

I think the more important thing is practice. Watch the videos and takes the quizzes and challenges—but also work on a project and apply what you're learning.