13 Hours? Easy.
A maze. The Labyrinth is not a simple maze; the pathways and openings in the walls of the maze change intermittently and are riddled with logic puzzles and tests. During Chris's training, the Labyrinth functioned as a makeshift Logrus. Though, whether it is always a Logrus, or if the Mysterious Cloaked Man at its entrance made it that way, no one can say for certain.