This mod changes the TPY to 12 which seems long but I found very nice to play with.
http://steamcommunity.com/sharedfile.../?id=250918885
Its companion mod scales the campaign such as movement points and technology acquisition for the above 12 TPY mod.
http://steamcommunity.com/sharedfile.../?id=251524480
EDIT: TITLE IS WRONG. This mod is 12 turns per game year and I made a mistake when creating the thread.