Because Jiang Nan could cultivate in the Life Forbidden Domain, doing so didn't consume any time in the real world!
Every time he made a little progress in the Six Paths Refining God technique, Jiang Nan would flash back and test it out!
By the time he returned, he had already mastered it. To Li Daoyan and the others, this was utterly unbelievable!
But it also meant that Jiang Nan had to spend long years in the Immortal Palace Starry Sky World!
It wasn't that Jiang Nan couldn't travel through time, but doing so would kill off future possibilities. Although the two worlds had different time flows, the Myriad Races Starry Sky World still developed in sync with Jiang Nan during long-distance time travel!
So unless absolutely necessary, Jiang Nan wouldn't travel through time!
Besides, progressing the Six Paths Refining God technique required Jiang Nan's personal involvement!
He had come here to improve himself. He couldn't let time go to waste. The stronger he was when he returned, the better his chances of settling everything!
But... those long years were indeed a kind of torment for someone as young as Jiang Nan!
For Li Daoyan and the others, who had lived long lives, what was thirty years? It passed in the blink of an eye!
But for Jiang Nan, it was longer than his entire life!
It was a terrifying feeling, watching the span of what you considered the most important years of your life grow shorter and shorter!
By the time more than three hundred years had passed, and the most passionate, most unforgettable years made up only a tenth of your life, would those experiences still feel as important as before?
The more he thought about it, the more afraid he became!
Of all things in this world,