If you would like to plunk out a few melodies, with minimal left-hand accompaniment, it is not too difficult. I would say a few months to a year you will be on your way. Factors that are important to consider though.
- Your prior musical experiences as a listener and possibly player of another instrument.
- Your physical health situation.
- Your ability to set time aside to practice.
- Your patience.
- Your instrument’s condition.
- Your desire level.
- Your ability to follow direction.
- Your inclination to initiate learning activities as well.
If you would like to play Classical piano at say grade 8, or early advanced level. Give it a decade from a standing start. In addition to the points above I would add the following: learn to love every aspect of the game. Do not skip a step: technique, repertoire, ear training, theory, history, etudes, etc. There are no hacks or shortcuts.
If you would like to play Jazz piano in a band, assuming you have already reached level 8 in abilities, give it a couple of years. All the points above are valid with the addition of a few other steps.
- Find people to play with early in your journey.
- Listen to jazz daily.
- Take an online jazz history course.
- Memorise 25 of the most common standards ASAP. You will spend the rest of your career building on this repertoire. Why memorise? It is difficult to keep track of everything with your head in the book.
- Extra focus on ear training.
If I can help, please call.