Task: Question Answering
Input (English): Passage: Elam was a pre-Iranic ancient civilization located to the east of Mesopotamia. In the Old Elamite period , Elam consisted of kingdoms on the Iranian Plateau, centered in Anshan, and from the mid-2nd millennium BC, it was centered in Susa in the Khuzestan lowlands. Its culture played a crucial role in the Gutian Empire and especially during the Iranic Achaemenid dynasty that succeeded it. The Oxus civilization was a Bronze Age Central Asian culture dated to c. 2300-1700 BC and centered on the upper Amu Darya . In the Early Bronze Age the culture of the Kopet Dag oases and Altyndepe developed a proto-urban society. This corresponds to level IV at Namazga-Tepe. Altyndepe was a major centre even then. Pottery was wheel-turned. Grapes were grown. The height of this urban development was reached in the Middle Bronze Age c. 2300 BC, corresponding to level V at Namazga-Depe. This Bronze Age culture is called the Bactria-Margiana Archaeological Complex . The Kulli culture, similar to those of the Indus Valley Civilisation, was located in southern Balochistan  c. 2500-2000 BC. Agriculture was the economical base of this people. At several places dams were found, providing evidence for a highly developed water management system. 
Question: How many years was the Kulli civilization located in southern Balochistan? 
Answer type: Number 
Output (English): 500.