When Durkon calls on Thor's specialty to break Control Weather, the lightning was said to have struck at least four miles away. Sound travels at around 350 meters/sec in air, which means it takes 5 seconds to go one mile (1600m). Durkon only counts to four.

Thus, either the viscoelasticity of the atmosphere is higher than on Earth (possible if the composition has a bunch of crazy-larger molecules), or miles are measured differently in OOTSverse (probably much more likely).