Any musical instrument takes a thousand hours of practice before you start to feel like you know what you are doing, and another thousand hours before anybody would want to listen to you. If you practice two hours a day you can get a thousand hours in about a year.
It depends how hard you work. If you practice such as only once a week, there is no chance of becoming a piano expert, but if you devote your time practicing every day, you should be able to master it. Good luck!
