"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.
Be content to grow a little each day. If the improvement is the sort of thing which is very slow, do not measure it too often. Do a self-comparison every two weeks, or every six months, whatever is appropriate.
