how is this possible? do you seriously have so much time at blizzcon to play the games?
I'm not sure how you managed to quote my post from a different thread and reply to it here...
Anyway, yes. The demo stations have hundreds of computers. You have to wait in line (typically 15-20 minutes) and then you get to play for ~20 minutes. If you did nothing else, you could theoretically play Diablo 3 for 12 hours over the two days (assuming 20 minute wait). There were many times when the wait was less during big WoW events/panels.