An A player ranking around here can hardly run out a rack in barbox 8 ball. I think what you mean by A player is typically called a Masters player in these parts. This is the equivalent to a BCA Advanced player.
I don't think I've seen anyone get to Masters ranking in under 10 years.
Let's say it takes 5000 hours. If you played 5 hours a day it would take you over 2.5 years to play that many hours. Each person is different though. Some require a lot more practice to get to a certain level than others. You have to develop the physical ability as well as the mental know how on what to do in all situations.
I don't think I've seen anyone get to Masters ranking in under 10 years.
Let's say it takes 5000 hours. If you played 5 hours a day it would take you over 2.5 years to play that many hours. Each person is different though. Some require a lot more practice to get to a certain level than others. You have to develop the physical ability as well as the mental know how on what to do in all situations.