Pressure, and train it until you get to about a 9 or 10 (at minimum, I might go up to at least 12 before I moved my focus onto another skill).  At 6'7, OD takes a little longer to train and it is painful when you are trying to train OD at 23 or 24 years old and it takes 4 weeks to pop.  If you want to break it up a bit, throw in a JR or One-On-One forwards.
And as far as the slowest skill to train, it depends on the player's height.  Generally speaking, OD trains a bit slower than most skills, but it is also one of the best.  However it will train faster than post skills for a player who is 6'0.  Passing and Ball Handling train quite fast, regardless of height.
Last edited by jv03 at 8/13/2014 9:23:56 PM