Clairvoyance uses time in ticks, the cost seems to suggest its supposed to be time in seconds, furthermore its affected by the length of the input direction vector, with the distance adding a multiplier. this also significantly increases cost (causing a 5 second clairvoyance with a distance of 2 to cost 6K psi)

meanwhile if you feed it a ray of X=1024, Y=0, Z=0 it will move your camera 1024 blocks in the X direction.