Sick volume is probably the reason why the average poker players' career is only 2 years.
Quality over quantity, as Hokie says..........it's a marathon, not a sprint
I actually read an article (don't have link sorry) on the top performers in various fields (sports, music etc), and they stated that even for top performers, to perform at their peak, no more than 4.5 hours of deliberate practice per day is achievable.