User blog comment:SayuriDarling/The House of Hades Official Discussion/@comment-24062146-20131027131901/@comment-24062146-20131028152332

I can see that. So, distance may not be a factor, unless traveling farther makes drains the power more quickly. Nico is more powerful now than a year ago, but he still needs to transport 2 other people and a huge statue.

Nico may have gone to China from the Underworld, where time and space is different. Traveling from place to place across land may be different.

Boo! to Rick for not giving us a direct POV on this action in BoO!