In 7 years of online play, I don't recall any final battles lasting longer than an hour, which I consider quite acceptable; after all, it's not Starcraft. If someone decides to do something about the final battles, I would greatly appreciate it if they also added a feature to save the battle progress in case of a disconnect. It's usually impossible to repeat complex battles after a disconnect by loading the save from before the battle, so you have to give up on fun battles, and you have to replay or decide tournament battles by flipping a coin. This doesn't just cost tens of minutes, but sometimes even hours.