Time Taken: Stamina checks are made when characters exert themselves over long periods of time. Whenever a character fails such a roll they are fatigued and operate at -1D to all actions until they rest for a time equal to that spent exerting themselves.
Stamina checks are useful to reflect that a character is being pushed to his or her physical limits - they should be called for once in a while, but the gamemaster shouldn't require characters to make stamina checks all of the time.
Characters can still continue if they are fatigued, until they fail a third stamina check. At that point, the character is completely exhausted and must rest for twice the amount of time that he exerted himself to remove the penalty. | 
