It will require around 8,300 hours or 346 days of the continuous walk to cover the circumference of the earth.
Considering the average walking speed of a human about 3 mph (4.8 kph) and the circumference of the earth is 24901 miles (40,075 km).
As per Guinness Book of Records, the first verified walk around the Earth was made by Dave Kunst which took four years, 20 million steps, and 21 pairs of leather shoes to complete his record-making 14,452 miles (23,258 km) walk in 1974.