Characters are often portrayed as fonts of energy and youth, but they do get tired and how quickly they get tired depends Taking actions at the different paces tires a lot on what they’re doingcharacter out at different rates. Everyone can move flat-out for 1 round per point of constitution, so even those of average constitution can run for at least a minute. Moving at a hustling pace for 1 minute is equivalent to 1 round of running. As most fights happen at this pace, this means that battles lasting longer than 1 minute per point of constitution may be hazardous for characters. Lastly, moving in an unhurried a normal way for 10 minutes is equivalent to 1 round of running. While that doesn’t have much bearing on combat, it does mean that you can walk across the mountains all day, resting for a minute or two every hour, without really wearing yourself out. Exactly like a heroic adventurer should.

Whatever action pace brings you to your limit, characters have to start making checks to see if they become tired once there. This is an endurance skill check, or just a constitution check if the skill is untrained. The base DC for this check is 10 or the DC to traverse the terrain, if it is difficult. Use the highest DC applicable. To that base you add +1 for every 5 points of subdual damage you’ve taken and a +1 penalty for each check you’ve made since you were last completely rested. The results of this check appear in the check result table below. If you become fatigued during your exertion, you’re done moving faster than a hustle for a while since the condition actually disallows taking any flat-out actions. If you become exhausted during your exertion, it stops you from doing pretty much anything beyond an unhurried a normal pace since it disallows everything except walking. You may also fall unconscious when you acquire the exhausted condition, if you have taken enough subdual damage, and that disallows everything except sleeping it off. Any subdual damage acquired will need to heal normally and does not heal at all during any hour in which you acquire more of it.

To become fully rested after an exertion, you have to rest for a while. Resting in this case means not taking any actions at even the unhurried normal pace, though you can take 5' moves to "walk it off" if you like. You must rest for 1 round per round of flat-out action or 1 minute, whichever is less. After the time has passed you are considered fully rested, and you are no longer fatigued if you acquired that condition as a result of these checks. If you became exhausted as part of your exertion, you must rest for 10 minutes to clear that condition before any time spent counts towards you being fully rested and clearing the fatigued condition. If you fell unconscious during your exertion, you have to wait for the subdual damage to heal to the point where you regain consciousness before you can being to recover from exhaustion. It takes a lot of time to recover from that sort of strain, so you should probably not do it unless you're really desperate.