Just a little bit I learned on Twitter from Temple Gate Games that I thought I would share.
Apparently (is this in the tutorial/instructions anywhere?), players have 7 days total to take their turns in the game before it times out. It's like setting Ticket to Ride for 7 days, as it's cumulative whenever it's your turn. If that's the case, I wish they had included a timer.
I did suggest to them that they use Digidiced's method of timing out, where you get the option of kicking a player if the game times out. That way, your random online games you can win, but if you're gaming with a friend, you can just let them take their time as necessary.
They seemed to like that idea, so I'm hoping that will be implemented in a future update.