SYSTEM REFERENCE DOCUMENT 3.5
Characters exploring an area use local movement, measured in feet per minute.
Walk: A character can walk without a problem on the local scale.
Hustle: A character can hustle without a problem on the local scale. See Overland Movement, below, for movement measured in miles per hour.
Run: A character with a Constitution score of 9 or higher can run for a minute without a problem. Generally, a character can run for a minute or two before having to rest for a minute