Two years and four months.
He spent some time acquiring quite a few cultivation techniques from the top sects of the eight great provinces.
They included the Heavenly Water Sect, Heavy Origin Sect, Shenxiao, Carefree Sect, Yin Mountain, Unlit Mountain, Heavenly Firmament Sect, and Five Elements Sect.
Apart from Blood Mountain, Sky Without Trace, and Supreme Artifact Sect, which he had been unable to find, Li Su had essentially gathered every sect-defining cultivation technique across the Nine Provinces.
Though they were called sect-defining techniques, they were really only at the immortal level, on the same tier as the Azure Luan Scripture of the Azure Luan Sect in Li Province.
Naturally, as top-tier techniques, they still had their own distinguishing traits.
First, their systems were relatively complete, with clear paths laid out. Following them step by step actually made cultivation easier than with ordinary immortal-level techniques.
Moreover, their power was exceptionally impressive. Each had its own specialties, and all were excellent in both offense and defense.
Although what Li Su had obtained were merely copied texts, direct scriptures rather than jade-slip inheritances, they were still quite easy for him to learn.
In less than a month, he had mastered all of those techniques, extracted their scriptures, and transformed them into patterns of Dao laws.
Cultivating them alongside his other techniques, he had brought every one of them to the level of a Tribulation-Transcending True Immortal.
Combined with the tempering of the Ancient Bell Scripture, Li Su's horizontal expansion within the realm of Tribulation-Transcending True Immortals was unquestionably frightening.
It could be said that if the realm of Taiyi still existed, then even if he did not want to, he would probably have been forcibly pushed across to the Other Shore. At this point, he was no longer a vessel overflowing once