More circles around IO> some circles around the Earth. That's because it IS explicitly contradicted: Goku taking 24 hours to cross 1.000.000 kilometers (betweem 5,000-8,000 battle power, Mach 33) Kuririn going all out taking 20 minutes to go from Kame House to the islands where Cell was. (13,000 battle power, assuming a distance of 10,000 km, Mach 24) Vegeta considering travelling 20,000 kilometers in a second a feat only possible with teleportation (1,000,000+ battle power, Mach 58,309) Piccolo taking 29 minutes to get where Gotenks was napping (150,000,000+ battle power) Earth's circumference: 40,000 km Gotenks circling around the Earth several times (5 as a low ball) Earth's surface area: 510,000,000 km 510,200,000 km in 29 minutes = 17,593,103 km/m So even if we assume that Piccolo was following Gotenks in his circling of the Earth and travelling across the entire surface of the Earth on top of that for no reason, it only give us 0.97 of the speed of light