Question: How long had China Sunergy's headquarters location been the capitol city of the area where Guangling District was located?

Knowledge 1: China Sunergy
China Sunergy () is a Chinese solar cell products manufacturer based in Nanjing, Jiangsu. The company specializes in creating solar cells from silicon wafers. China Sunergy has a major customer base in China, but also sells their products internationally. On May 17 2007 the company began producing both monocrystalline and multicrystalline silicon solar cells. In 2012 the annual production of the cells were 1 GW and PV modules 1.2 GW. After listing as a NASDAQ Company in 2007, in 2013 May 23 China Sunergy opened its first international manufacturing base in Turkey. Turkey factory has the biggest solar cell and module capacity among both in Turkey and Europe. CSUN currently is the only Chinese solar cells and module manufacturer with a manufacturing base in Europe. Located in Tuzla Free Trade Zone, Istanbul, CSUN (Turkey) is in progress of building its second factory in Turkey within 2015. CSUN has been recognized as a Tier 1 module supplier by the Bloomberg New Energy Finance (BENF) PV Module Maker Tiering System on 23 March 2014. [SEP] Knowledge 2: Nanjing
Archaeological discovery shows that "Nanjing Man" lived in more than 500 thousand years ago. Zun, a kind of wine vessel, was found to exist in Beiyinyangying culture of Nanjing in about 5000 years ago. In the late period of Shang dynasty, Taibo of Zhou came to Jiangnan and established Wu state, and the first stop is in Nanjing area according to some historians based on discoveries in Taowu and Hushu culture. According to legend,[which?] Fuchai, King of the State of Wu, founded a fort named Yecheng (冶城) in today's Nanjing area in 495 BC. Later in 473 BC, the State of Yue conquered Wu and constructed the fort of Yuecheng (越城) on the outskirts of the present-day Zhonghua Gate. In 333 BC, after eliminating the State of Yue, the State of Chu built Jinling Yi (金陵邑) in the western part of present-day Nanjing. It was renamed Moling (秣陵) during reign of Qin Shi Huang. Since then, the city experienced destruction and renewal many times.[citation needed] The area was successively part of Kuaiji, Zhang and Danyang prefectures in Qin and Han dynasty, and part of Yangzhou region which was established as the nation's 13 supervisory and administrative regions in the 5th year of Yuanfeng in Han dynasty (106 BC). Nanjing was later the capital city of Danyang Prefecture, and had been the capital city of Yangzhou for about 400 years from late Han to early Tang. [SEP] Knowledge 3: Guangling District
Guangling District () is one of three districts of Yangzhou, Jiangsu province, China. The district includes the eastern half of Yangzhou's main urban area (including Yangzhou's historic center within the former city wall), and the city's eastern suburbs. The other half of the city's main urban area is in Hanjiang District.
Knowledge 1: Guangling District
Guangling District () is one of three districts of Yangzhou, Jiangsu province, China. The district includes the eastern half of Yangzhou's main urban area (including Yangzhou's historic center within the former city wall), and the city's eastern suburbs. The other half of the city's main urban area is in Hanjiang District. [SEP] Knowledge 2: China Sunergy
China Sunergy () is a Chinese solar cell products manufacturer based in Nanjing, Jiangsu. The company specializes in creating solar cells from silicon wafers. China Sunergy has a major customer base in China, but also sells their products internationally. On May 17 2007 the company began producing both monocrystalline and multicrystalline silicon solar cells. In 2012 the annual production of the cells were 1 GW and PV modules 1.2 GW. After listing as a NASDAQ Company in 2007, in 2013 May 23 China Sunergy opened its first international manufacturing base in Turkey. Turkey factory has the biggest solar cell and module capacity among both in Turkey and Europe. CSUN currently is the only Chinese solar cells and module manufacturer with a manufacturing base in Europe. Located in Tuzla Free Trade Zone, Istanbul, CSUN (Turkey) is in progress of building its second factory in Turkey within 2015. CSUN has been recognized as a Tier 1 module supplier by the Bloomberg New Energy Finance (BENF) PV Module Maker Tiering System on 23 March 2014. [SEP] Knowledge 3: Nanjing
Archaeological discovery shows that "Nanjing Man" lived in more than 500 thousand years ago. Zun, a kind of wine vessel, was found to exist in Beiyinyangying culture of Nanjing in about 5000 years ago. In the late period of Shang dynasty, Taibo of Zhou came to Jiangnan and established Wu state, and the first stop is in Nanjing area according to some historians based on discoveries in Taowu and Hushu culture. According to legend,[which?] Fuchai, King of the State of Wu, founded a fort named Yecheng (冶城) in today's Nanjing area in 495 BC. Later in 473 BC, the State of Yue conquered Wu and constructed the fort of Yuecheng (越城) on the outskirts of the present-day Zhonghua Gate. In 333 BC, after eliminating the State of Yue, the State of Chu built Jinling Yi (金陵邑) in the western part of present-day Nanjing. It was renamed Moling (秣陵) during reign of Qin Shi Huang. Since then, the city experienced destruction and renewal many times.[citation needed] The area was successively part of Kuaiji, Zhang and Danyang prefectures in Qin and Han dynasty, and part of Yangzhou region which was established as the nation's 13 supervisory and administrative regions in the 5th year of Yuanfeng in Han dynasty (106 BC). Nanjing was later the capital city of Danyang Prefecture, and had been the capital city of Yangzhou for about 400 years from late Han to early Tang.
Knowledge 1: Guangling District
Guangling District () is one of three districts of Yangzhou, Jiangsu province, China. The district includes the eastern half of Yangzhou's main urban area (including Yangzhou's historic center within the former city wall), and the city's eastern suburbs. The other half of the city's main urban area is in Hanjiang District. [SEP] Knowledge 2: China Sunergy
China Sunergy () is a Chinese solar cell products manufacturer based in Nanjing, Jiangsu. The company specializes in creating solar cells from silicon wafers. China Sunergy has a major customer base in China, but also sells their products internationally. On May 17 2007 the company began producing both monocrystalline and multicrystalline silicon solar cells. In 2012 the annual production of the cells were 1 GW and PV modules 1.2 GW. After listing as a NASDAQ Company in 2007, in 2013 May 23 China Sunergy opened its first international manufacturing base in Turkey. Turkey factory has the biggest solar cell and module capacity among both in Turkey and Europe. CSUN currently is the only Chinese solar cells and module manufacturer with a manufacturing base in Europe. Located in Tuzla Free Trade Zone, Istanbul, CSUN (Turkey) is in progress of building its second factory in Turkey within 2015. CSUN has been recognized as a Tier 1 module supplier by the Bloomberg New Energy Finance (BENF) PV Module Maker Tiering System on 23 March 2014. [SEP] Knowledge 3: Kiri Territory
Kiri Territory is an administrative region in the Mai-Ndombe District of Bandundu Province, Democratic Republic of the Congo. The headquarters is the town of Kiri.

Answer: about 400 years