Conversation so far:
Where did Xi Jinping grow up?
Xi Jinping was born in Beijing on 15 June 1953.
Where did Xi Jinping attend school?
From 1975 to 1979, Xi Jinping studied chemical engineering at Beijing's Tsinghua University as a Worker-Peasant-Soldier student.
Was Xi Jinping involved in the Cultural Revolution?
In May 1966, the Cultural Revolution cut short Xi Jinping's secondary education when all secondary classes were halted for students to criticise and fight their teachers.
Was his father a member of the Communist government?
The son of Chinese Communist veteran Xi Zhongxun, Xi Jinping was exiled to rural Yanchuan County as a teenager following his father's purge during the Cultural Revolution.
What part did Xi play in the Cultural Revolution?
Xi Jinping was sent to work in Liangjiahe Village, Wen'anyi Town, Yanchuan County, Yan'an, Shaanxi, in 1969 in Mao Zedong's Down to the Countryside Movement.

Question: How long was he at the work camp?
Self-contained rewrite: How long was he at the work camp?