The beginning was finished approx. 200BC,the ending was over 200 years taking place during the Ming Dynasty,1367-1643. Noone knows the "exact" amount of time it took.
The construction of the Great Wall of China took place during a series of dynasties between the fifth century BCE and the 16th century. Sections of the wall were built and rebuilt starting with the first emperor of China.
there are different emperor's ruled china over 2000 years. every part takes 200 years to complete. the last part took 500 years. there are more than 1 to 2 million people died during the construction of great wall of china.