Very few conflicts in the history of the world have been satisfactorily concluded according to a published timetable, because you lose all flexibility in dealing with your opponents.
"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.