This is a brilliant Article. A must read!
Still healing from an injury, my practice Plan is modified. However I subscribe to the, 20 min. practice / 5 pause / 20 min. practice / 5 pause / 20 min. practice / 15 min. pause - then start from the beginning. At this time, I can only do 15 mins / 5 pause / 15mins then off for at least an hour. With light work. Have to focus on light touch and position of my arm, wrist and pressure being used. Getting better everday, but one must be very cautious when playing while recovering from an injury.
Peace...
TS