Started my challenge with a 2 hour session yesterday, didn't run particullary good, remember losing many AK vs Ax in the first games. I also lost HU once when my opponent was auto AI first hand, lol.  
Played a total of 27 games and broke even at the end. Have a lot of spare time now, but don't know how many games I have time to play before the server restart at 0700 ET.