TEN THOUSAND HOURS RULE

In essence, the 10,000 hour principle is a confirmation of the maxim made famous by Edison: genius is 1% inspiration, 99% perspiration. 

Outliers by Malcolm Gladwell repeatedly mentions the "10,000-Hour Rule", claiming that the key to achieving world class success in any field is, to a large extent, a matter of practicing a specific task for a total of around 10,000 hours.
 

To find your success zone in trading at 5 hours per trading session equates to 8 years.  During the practicing process, there are no failures, only feedback.