The flow of time across the underworld was symmetrical to the rest of the world. Maybe time moved slower down here by one hundred of a second, on account to the underworld being closer to the planet's core, but even that was debatable. Or completely wrong.
The process of night and day, however, was a lot more complicated.
Jimmy and Anna kept riding through the jungle, on Almara's back, and they did so for around eight hours, either fighting every creature that attacked them, or trying their best to avoid another fight.
The jungle kept them busy, but at some point, they noticed that they were getting tired. Neither of them knew what time of day it was, because the process of night and day was not visible down here.
