The downside of a 30 mins game is that if you're unlucky you might meet a jerk who won't resign in a loosing position and won't move and let you wait 20 minutes to claim the win.
I think they should add an "are you there?" notification after 5 minutes of not moving. That way people who are a-holes would have to stay themselves by the screen and waste their own time as well if they are poor loosers.
Why?