Question: How long had Anhua Gao's birthplace been the capitol city of Yaxing Coach's headquarters location?

Knowledge 1: Yaxing Coach
Yaxing Coach (Yangzhou Yaxing Motor Coach Co., Ltd) is a bus manufacturer based in Yangzhou, Jiangsu, China. It is a subsidiary of Jiangsu Yaxing that was founded in 1998. Buses are produced under the "Yaxing", "Yangtse（Yangzlv）", and more recently Asiastar brands. [SEP] Knowledge 2: Anhua Gao
Anhua Gao was born in 1949 in Nanjing, Jiangsu Province, China. Gao's parents were both veteran Communists, and People's Liberation Army (PLA) high officials. Both parents died when Gao was a small child, of a combination of the effects of malnutrition and very poor medical care. After their deaths, they were hailed as revolutionary martyrs by the Maoist government, a title which protected Gao and her siblings from the worst excesses of the Cultural Revolution but did not spare Gao extreme hardship, persecution and even torture. [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: Anhua Gao
Anhua Gao was born in 1949 in Nanjing, Jiangsu Province, China. Gao's parents were both veteran Communists, and People's Liberation Army (PLA) high officials. Both parents died when Gao was a small child, of a combination of the effects of malnutrition and very poor medical care. After their deaths, they were hailed as revolutionary martyrs by the Maoist government, a title which protected Gao and her siblings from the worst excesses of the Cultural Revolution but did not spare Gao extreme hardship, persecution and even torture. [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: Yaxing Coach
Yaxing Coach (Yangzhou Yaxing Motor Coach Co., Ltd) is a bus manufacturer based in Yangzhou, Jiangsu, China. It is a subsidiary of Jiangsu Yaxing that was founded in 1998. Buses are produced under the "Yaxing", "Yangtse（Yangzlv）", and more recently Asiastar brands.
Knowledge 1: Yaxing Coach
Yaxing Coach (Yangzhou Yaxing Motor Coach Co., Ltd) is a bus manufacturer based in Yangzhou, Jiangsu, China. It is a subsidiary of Jiangsu Yaxing that was founded in 1998. Buses are produced under the "Yaxing", "Yangtse（Yangzlv）", and more recently Asiastar brands. [SEP] Knowledge 2: Anhua Gao
Anhua Gao was born in 1949 in Nanjing, Jiangsu Province, China. Gao's parents were both veteran Communists, and People's Liberation Army (PLA) high officials. Both parents died when Gao was a small child, of a combination of the effects of malnutrition and very poor medical care. After their deaths, they were hailed as revolutionary martyrs by the Maoist government, a title which protected Gao and her siblings from the worst excesses of the Cultural Revolution but did not spare Gao extreme hardship, persecution and even torture. [SEP] Knowledge 3: Princess Pingyi
It is not known when she was born to Yuan Dan (元亶) the Prince of Qinghe, a grandson of Emperor Xiaowen, but what is known is that during the reign of Emperor Xiaowu (532-535), she was created the Princess Pingyi. In 534, Emperor Xiaowu, seeking to escape the grasp of Gao Huan, fled west from the capital Luoyang to the domain of the independent general Yuwen Tai. Gao Huan subsequently made her brother Yuan Shanjian emperor (as Emperor Xiaojing), signifying a division of Northern Wei into Eastern Wei (with Emperor Xiaojing as emperor) and Western Wei (with Emperor Xiaowu as emperor). She was subsequently given to Gao Huan's son Gao Cheng as his wife, although the date of the marriage is not known.

Answer: about 400 years