Question: How long had Pfrang Association's headquarters location been the capitol city of the area where Guangling District is located?

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: Pfrang Association
Pfrang Association (also known as Pfrang) is a charitable organization based in Nanjing, China which raises money to assist with the education of children in the poor and rural regions of Jiangsu Province. Its aim is to help overcome social inequality and as a result break the cycle of lack of education, poverty, and crime. [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: Pfrang Association
Pfrang Association (also known as Pfrang) is a charitable organization based in Nanjing, China which raises money to assist with the education of children in the poor and rural regions of Jiangsu Province. Its aim is to help overcome social inequality and as a result break the cycle of lack of education, poverty, and crime. [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: Pfrang Association
Pfrang Association (also known as Pfrang) is a charitable organization based in Nanjing, China which raises money to assist with the education of children in the poor and rural regions of Jiangsu Province. Its aim is to help overcome social inequality and as a result break the cycle of lack of education, poverty, and crime. [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