20 minutes may seem to short for many, but if you have 4 decent sized battles in a turn, thats 80 minutes, and if that happens next turn (it probably will, with naval and land battles) 80 minute turns arent so appealing as when you begin to get many enemies im sure that will be feasible amount of battles.
The battles are obviously going to be longer because of land mostly shooting, which could be lengthy, plus theres all these abilites to lay down fortifications and garrison buildings, that could delay things massively. Sea battles will take a while because boats will take ages to be destroyed and even if you board a ship the fighting will take a while and the other ships will still be fighting.
Whether there long enough for orgahs or not, there almost guaranteed to be longer than in previous total war games, and i wouldnt want them to drag on forever.
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