Currently, the 10 seconds is ok, but thats only because you can't save/load a game. Just need an option for the next patch for between 10secs-1min, or no timer at all.
The good thing about when you press end turn, is that you can STILL do stuff, search around your towns, look at kingdom reports. Most games have you staring at a picture after you press end turn, and i am grateful that is NOT the case here.