How many people have walked the entire length of the great wall?

Gayle C. Hall was the first woman to walk the wall. Dr. Gayle Hall, an avid long-distance hiker, received her doctorate from Indiana University in Physical Education Administration and worked in the IU School of Education in education research as associate director of the Indiana Education Policy Center. In 1998 she walked the Appalachian Trail, and in 2002 she walked along the Great Wall of China. Called an "Iron Woman" by the Chinese mass media, Dr. Hall began her journey at Yumengguan, the western end of the Great Wall, in remote northwestern China. It took her and two Chinese companions 174 days to cover more than 4,000 kilometers and reach the eastern end of the Great Wall. Many had said that the three would never make it ...cultural, gender, age, and education differences would drive them apart ...But the three started and finished together, and Dr. Hall's name finally went down in Chinese history as the first woman to walk the complete length of the Great Wall.