Two days.
Li Xia first took Kagome back to the other side of the Bone-Eater's Well...
After planting a sapling to strengthen his sense of the anchor, he returned to Kaede's Village and temporarily dismantled the Bone-Eater's Well...
Then he met with Totosai, Sesshomaru, and the others...
After that, he returned to Mount Hakurei and used Sōunga's power to visit the Demon Graveyard...
He drove Naraku back, took Hōsenki's power, and planted a new Tree of Ages and an Inheritance Vessel to collect tolls...
Finally, using Hōsenki's connection to the Black Pearl, he pursued Naraku relentlessly and caught him completely off guard!
In just two short days, he had acted with remarkable efficiency.
His only regret was that Naraku was growing at an equally astonishing rate.
In the Original Timeline, if all the movies were taken into account, Naraku should have completed his transformation at Mount Hakurei by now, right?
Li Xia could readily make that judgment based on how many times Inuyasha had turned human on the night of the new moon.
However, this differed from Naraku's situation in the original story.
The original Naraku had completed his transformation inside Mount Hakurei.
But in the timeline Li Xia currently occupied, Naraku had used Tessaiga to accomplish something similar, becoming even more troublesome.
Naraku after emerging from Mount Hakurei might have had stronger demon power than the current Naraku, but his only outstanding abilities were his barrier and miasma, so he wasn't all that dangerous. This Naraku's abilities, though, have become stranger and more varied.
For one, after absorbing the Medicine Elder Poison Immortal's power, his poison had definitely become even more toxic.
His barrier had also become considerably tougher thanks to the demon power of Ōgamaru and his son.
His body's overall strength, resilience, and vitality had improved greatly