In the Astral Domain of Vast Heaven.

It took Zhang Han and his companions a month to get to the other end of the Astral Domain.

"That's the disadvantage of being in the territory of the Four Great Sects. There are many places where there are restrictions on flights," Grand Master Chu said. "Otherwise, with the speed of the Thunder Snake, we would have been able to arrive in ten days."

"It will be much better after we leave the Astral Domain," ...