I received a token youth yesterday for the full 24 tokens. I managed to PT him to a new position before my 7pm League game. As a rough estimate, he gets 5x the number stated for average gain on each exercise when on hard training. So for a 4* token youth, that's 50/100/150.
Going back to the position training, if you think about it I got him up by over 50 points in less than a day of power training. Do it regularly enough and you'll probably have a scout after 3/4 days.