The only things that are impossible to learn are schools and so-called training centers. I hope you can really understand the key.
As for how long it takes to study, if you go to school, you can follow the school plan, two years? Three years? Five years? Mainly because of academic qualifications, if the opportunity is good, you can learn bread with a good teacher for up to three days. In fact, a normal person can get started in just one day, and it takes several weeks for dessert chocolate and the like, but it takes at least 20 years of experience to really understand and master the technology of West Point.
If you want to make a living, West Point is actually very difficult. If you must, you'd better consult the raw material supplier. It may not be easy to understand. When you really make a living, you will understand why.