Every twenty million years meant a crossing of the tribulation, leading to Gu An's investment of one hundred million years of life span only allowing for five tribulations.
With almost no suspense, each attempt ended in failure.
With four billion years of life span left, could he attempt the tribulation two hundred more times?
This time, he must reserve at least five hundred million years for the Life Span Barrier to avoid any incidents.
Gu An took a deep breath and continued to invest life span, still in one hundred million-year increments.
Above him, Dao Spiritual Qi swirled like fog, as if the Celestial Vault churned, oppressive and magnificent, with huge figures flitting by, now hidden, now visible.
Gu An never looked up, focusing solely on investing his life span.
One hundred million followed by another hundred million!
Soon, a billion years of life span was gone, and Gu An's expression darkened.
Keep going!