Marathon now is the old Eternity of my GS system, 8000 turns. Tried that, done that, still don't have time for that.
I'm trying to get into the late game Eras to see how stability is. And that eats up enough of my time. Even on a 1000 turn GS. Not too many of the Modders can say this on any where near a regular basis.
The most active modders are all about adding new stuff. Not game testing into the late Eras. Has always been that way with C2C. Some one has to slog thru the 929 techs thru 15 Eras to find out if all these "new ways" and "gizmos" actually work or not.