Does it really matter how many games you are playing? I used to play 50 games at once but these were all against high rated players.
If you are playing against not so strong players you might be able to play 1000 games at once.
It is a interesting stat however.
When I was 15 i would play and finish about 80 to 100 games a day but against players who were not strong. [these were all simuls]
i try to play areound 12-15. If i try to play more game at same time, i move too fast and i make silly mistakes (I make them anyway haha)