What about 12 hour games?
I started a few days ago, but I'm getting pretty annoyed by people that miss their turns. I have to wait 24 hours before I can play again. Since I am not premium and not planning to, I can't play 5 minute games.
So games with a roundtime of 12 hours would be a good idea. You have enough time to do something. Also I'd like if free members could also play 12 hour games xD