It varies for me. In the beginning I take my time building and fighting battles, since I need to make every florin count to get ahead. Later in the mid game things slow down even more. My good neighbors attack me and I takes a long time to carefully move all those full stacks to fight all of them. Finally at the end I just occasionally check that all building queues are full and move my legions in the general direction of my backwards surviving enemies, so things speed up considerably.