When I played at pogo.com they would show advertisements every few games. I would like to have the same thing here because:
1. I may want to say something to my opponent and there is no time at all between games.
2. I may I want to say something to watchers.
3. I may I want to go and grab a drink from the kitchen.
4. I may want to go to the bathroom.
My suggestion is 30 second breaks after every third game when I'm playing the same opponent. Also you could throw in a 60 second break every now and then.