How long did it take to build the great wall of China and how long is it?
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M$4 Answers
http://www.travelchinaguide.com/china_great_wall/
Most was built in the Ming Dynasty (1368-1644).
http://www.thegreatwall.com.cn/en/goc/goc-1.htm
Some was built "220–206 BC by the first Emperor of China, Qin Shi Huang. Little of that wall remains; it lay farther north than the current wall, which was built during the Ming Dynasty"
http://en.wikipedia.org/wiki/Great_Wall_of_China
So if these accounts are accurate it appears it took about 240 years to build.
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M$Construction on the Great Wall of China, however, first began in 7th century B.C. In 221 B.C., the first emperor of Qin Dynasty linked the walls of the three states in the north and formed the first "Wan Li Chang Cheng" (ten thousand li Great Wall, 2li = 1km).
Since that time, there has been rebuilding, modification and extending of the Great Wall for over 2,000 years. If you include all of the walls built in different dynasties, the total length exceeds 50,000 kilometers, or 31,068 miles.
Here is a fabulous 360 Degree Tour of the Great Wall of China.
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M$http://www.egreatwallchina.com/
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M$2. 300,000 soldiers built the wall
3. 1.8 million laborers were called up
4. 250 m of the Great Wall could be built in a year
5. 4,000 miles long
6. Height is 25 feet
7. Some stone height are two meters and weigh hundreds of kilograms. Carried by human labor.
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M$

thank you!
Very nice answer.
I'm going to have a tough job picking the best answer out of these 2.
They are both good answers.