YEARS  AGO
Most complexes have more than one temple with a common outer wall and courtyard. The underground burial shrines that seem to go with them have not all been found yet.

An engineer calculated the time and resources that would be required to build a temple in Stone Age Malta.  This includes quarrying, transporting, dressing and installing the stones, carving and decorating, roofing and plastering the interiors and whatever painting and furnishing was done.  He came up with an estimate of 35,000 "man-days". 

Assuming nine months of the year would be taken up by food production, that would be roughly 130 men, working three months of the year for about three years.

Estimates for maximum population on the islands during the time of the temples range around  10,000 people, living in various communities: each "village" with its own temple complex.