Let's ASSUME that 200k hands would be a good indicator of where a player is with the bb/100 scale. This is only an indicator of how this player ranks based on his/her previous 200k hands. I know that 200k hands from now, I will be a much better player than I am today. Unfortunatly, I can't scale my improvement.

Unless, one were to graph each set of each 25k hands, and observe the trends on a line.