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

Context paragraphs:
paragraph_text: Port Blair (pronunciation (help info)) is the capital of the Andaman and Nicobar Islands, a union territory of India situated in the Bay of Bengal. It is also the local administrative sub-division (tehsil) of the islands, the headquarters for the district of South Andaman, and is the territory's only notified town. It houses the headquarters of the Andaman and Nicobar Police and the Andaman and Nicobar Command, the first integrated tri-command of the armed forces of India.
title: Port Blair
paragraph_text: Coquimbito is a rural district in the Maipú Department, Mendoza Province, Argentina. It is located in the southeast of the metropolitan area of Mendoza (the provincial capital), and is administratively part of the municipality of Maipú. The name refers to the Chilean port city of Coquimbo.
title: Coquimbito
paragraph_text: 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.
title: China Sunergy
paragraph_text: 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.
title: Nanjing
paragraph_text: Forlanini is a district ("quartiere") of Milan, Italy. It is part of the Zone 4 administrative division, located east of the city centre.
title: Forlanini (district of Milan)
paragraph_text: Irkutsky District () is an administrative district, one of the thirty-three in Irkutsk Oblast, Russia. Municipally, it is incorporated as Irkutsky Municipal District. It is located in the south of the oblast. The area of the district is . Its administrative center is the city of Irkutsk (which is not administratively a part of the district). As of the 2010 Census, the total population of the district was 84,322.
title: Irkutsky District
paragraph_text: "Love Around" was filmed entirely on location in Taiwan. Asia FM 92.7, the radio station depicted in the drama is an actual free to air radio station in Taiwan with its headquarters and broadcasting station in Taoyuan City, Taoyuan County. The building and set used in the drama to depict the radio station is actually an office building located at 257 Xinhu 2nd Rd., Neihu District, Taipei City, which is only a few blocks from Sanlih's broadcasting headquarters in the Neihu District of Taipei. The resort that Zhou Zhen owns is the former "Leo Ocean Resort" now called "EHR Hotels & Resorts Yilan", located in Yilan County. The homes of both main lead characters are located in the newly developed area of Danshui District New Taipei City.
title: Love Around
paragraph_text: Haifa District (, "Mehoz Ḥeifa"; ) is an administrative district surrounding the city of Haifa, Israel. The district is one of seven administrative districts of Israel, and its capital is Haifa. The district land area is 864 km (299.3 mi).
title: Haifa District
paragraph_text: The Majura Training Area (MTA) is a facility belonging to the Australian Department of Defence located to the east of Mount Majura in the Majura district in the Australian Capital Territory, Australia. The MTA is used primarily by the Australian Army for the conduct of field exercises and weapon qualification shoots. The MTA is located near to the Royal Military College, Duntroon and the Australian Defence Force Academy and is frequently used by these training establishments. Accommodation and support on the range is through 'Camp Blake', which consists of headquarters buildings, Q-Store, Mess, Staff accommodation and amenities and trainee accommodation and amenities.
title: Majura Training Area
paragraph_text: Ghaziabad district (pronounced [ɣaːziːaːˈbaːd̪ ˈzɪlaː]) is a largely suburban district of Uttar Pradesh state in northern India of National Capital Region.  The city of Ghaziabad is the administrative headquarters of the district. This district is part of Meerut Division.  It has become a major bedroom community for Delhi.
title: Ghaziabad district, Uttar Pradesh
paragraph_text: Leninsk-Kuznetsky District (, ) is an administrative district (raion), one of the nineteen in Kemerovo Oblast, Russia. As a municipal division, it is incorporated as Leninsk-Kuznetsky Municipal District. It is located in the west of the oblast. The area of the district is . Its administrative center is the city of Leninsk-Kuznetsky (which is not administratively a part of the district). Population: 27,825 (2002 Census);
title: Leninsk-Kuznetsky District
paragraph_text: Sandasar is a village and union council (an administrative subdivision) of Mansehra District in the Khyber Pakhtunkhwa Province of Pakistan. It is located in the south of the district and lies to the west of the district capital Mansehra.
title: Sandasar
paragraph_text: Phulrraa is a village and union council (an administrative subdivision) of Mansehra District in Khyber-Pakhtunkhwa province of Pakistan. It is located in the south of the district and lies to the west of the district capital Mansehra.
title: Phulrraa
paragraph_text: Lyuberetsky District () is an administrative and municipal district (raion), one of the thirty-six in Moscow Oblast, Russia. It is located in the central part of the oblast east of the federal city of Moscow. The area of the district is . Its administrative center is the city of Lyubertsy. Population: 265,113 (2010 Census); The population of Lyubertsy accounts for 65.1% of the district's total population.
title: Lyuberetsky District
paragraph_text: Xinhui People's Hospital is a hospital located in the Xinhui District of Jiangmen City, Guangdong Province, China, affiliated to the Southern Medical University.
title: Xinhui People's Hospital
paragraph_text: 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.
title: Guangling District
paragraph_text: Remire-Montjoly is a suburb of Cayenne, the capital "préfecture" and largest city of French Guiana. It is located to the south-east of Cayenne. Residential districts are located along some of the best beaches in the Cayenne area.
title: Remire-Montjoly
paragraph_text: Alamnagar (community development block) is one of the administrative divisions of Madhepura district in the Indian state of Bihar. The block headquarters are located at a distance of 58 km from the district headquarters, namely, Madhepura. The name of Alamnagar is named for Shah Alamgir.
title: Alamnagar
paragraph_text: Sokolniki District () is a district of the Eastern Administrative Okrug of the federal city of Moscow located in the north-east corner of the city. Population:
title: Sokolniki District
paragraph_text: 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.
title: Kiri Territory

Reasoning steps:
China Sunergy >> headquarters location >>>> Nanjing
Guangling District >> located in the administrative territorial entity >>>> Yangzhou
How long had Nanjing been the capital city of Yangzhou ? >>>> about 400 years

Answer: spans: about 400 years