Part of the mod. This is because the mod spans around 300 years. 4 turns per year means you'll get 1200 turns - far too long, whereas 2 tpy is 600 turns, much more manageable.

For comparison, Medieval 2 TW is 2 years per turn

Is there a submod to allow 4TYP ? It is super annoying. My Teutonic campaign is severely limited. It takes 4 turns practically to make it to the nearest enemy.