How long does it take for sound to travel around the world?

Sound travels at approximately 343 meters per second (1,125 feet per second) in air at room temperature. The Earth's circumference is about 40,075 kilometers (24,901 miles). Therefore, it would take sound roughly 1.2 hours to travel around the world if conditions were ideal and there were a continuous medium for sound to propagate. However, in reality, sound cannot travel through the vast distances of the atmosphere without significant attenuation.