"The Bodhisattvas with compassionate hearts sacrifice themselves for planetary humanities through successive Mahamanvantaras, and finally, they achieve the incarnation of Christ." (The Pistis Sophia Unveiled, chapter 67)
Each Mahamanvantara lasts 311,040,000,000,000 years, so for a Bodhisattva it would take several Mahamanvantaras of helping innumerable humanities to earn the right of incarnating the Christ? I was under the impression that it could be accomplished in several lifetimes, or even one.