FAIRadiusToRunDetectionExterior

Distance from the player to the actor (NPCs, creatures) at which the game starts checking whether the actor notices the player. For hostile actors, this is the distance where the actor may notice the player and attack, assuming the player is not hidden in some way.

FAIRadiusToRunDetectionExterior only applies outside of dungeons and buildings - in the wilderness. See FAIRadiusToRunDetectionInterior for dungeons and buildings.