It’s been about 14 years since I was a beginner like you. I was 42 years old at the time. No dance experience, reasonably strong (always a weight lifter) and moderate flexibility. I am fairly athletic in general at these sorts of unusual athletic pursuits (I can’t throw or catch a ball to save my life). At the time I believe I worked up to being able to do most of the advanced level 2 in Veena’s programs and some advanced level 3 within a year or so. I was able to invert on my very first try and could immediately do gemini and scorpio as well so maybe that will help you gauge how long it will take you.