Developing skills involves concerted effort at the limit of current capacity for short periods (20-30 minutes), followed by rest and recovery, which drives plastic reorganization.

“it's often this you know concerted effort for a short period of time where you are right at the limit of your current capacity... and then um you know maybe you could put a time frame on it maybe it's somewhere between you know 20 or 30 minutes something like that... and then you know probably there's some failure in there because the process of failure sort of up regulates our the processes of focus and attention as well up to a point before we get frustrated and then there's some rest and Recovery”