I use the standard number of turns, but I've extended the game so it won't end before 1990... Since I just display number of turns this just means a long time after the last significant gameevent, in case I want to continue playing (usually I don't).

I did play with 2 turns pr. year (0,5) in the beginning, but I realized that I never got to go to the new world and recruit musketeers if I used the corrected events-file for that turn-speed.