How long does it take sound to circle earth?

Sound travels at approximately 343 meters per second (1,125 feet per second) in air at sea level and at room temperature. The Earth's circumference is about 40,075 kilometers (24,901 miles). Therefore, it would take sound roughly 1,200 hours, or about 50 days, to circle the Earth if it could travel uninterrupted around the globe. However, in reality, sound dissipates and does not propagate indefinitely in the atmosphere.