Actually, the twelve hours waiting period was absolute cosmic time. Lin Fei could easily have brought Huo Yan into the Spirit Realm Space within the Divine Dragon Sacred Cauldron, where the flow of time was vastly accelerated.
That way, Lin Fei could have spent much more time keeping Huo Yan company.
Yet he did not do so. Now that Huo Yan was completely unconscious, what meaning would such companionship hold?
Chapter 1564