How many years of training does it take, to get good at playing the piano?
user
I’m glad you asked, that is a common question that people have about becoming an expert. Let’s see what the research says:

The US Department of Labor notes that “Musicians and singers must spend many years learning their craft. Some require formal education. For example, jazz pianists must take special lessons to learn to improvise.” I find that piano teachers spend about 4 years of concentrated learning to reach the level of the more advanced, published pianists.
assistant
That's a good generalized description. I have a friend who's a piano teacher, and she studied for many years before becoming professional.
user
That’s cool, I’m glad your friend has such a satisfying job!
assistant
What are commonly accepted methods, for educating yourself, to be a pianist professionally?
user
If you want to study formally, you can get a Bachelor of Music from a conservatory, usually with a focus in piano or related instruments. Conservatory programs are usually not only about musical training, but also pedagogy, music theory, and other related fields. Many conservatories and universities also offer online degree programs for pianists.
assistant
How many years of training does it take, to get good at playing the piano?
user
I’m glad you asked, that is a common question that people have about becoming an expert. Let’s see what the research says:

The US Department of Labor notes that “Musicians and singers must spend many years learning their craft. Some require formal education. For example, jazz pianists must take special lessons to learn to improvise.” I find that piano teachers spend about 4 years of concentrated learning to reach the level of the more advanced, published pianists.
assistant
That's a good generalized description. I have a friend who's a piano teacher, and she studied for many years before becoming professional.
user
That’s cool, I’m glad your friend has such a satisfying job!
assistant
What are commonly accepted methods, for educating yourself, to be a pianist professionally?
user
According to the US Department of Labor, it’s generally a good idea to get professional instruction: “Many professional musicians receive their first lessons in piano, trumpet, or other instruments at a music school or university. Most children begin piano instruction at about age seven.”  
The American Music Conference states: “The most successful musicians almost always had early and well-planned training programs. A student's motivation must be at a high level if he or she is to make a commitment of time, effort, and energy that will sustain a lifetime of activity.”
assistant
How many years of training does it take, to get good at playing the piano?