Supplemental electrolytes in a balanced formula (not just salt!) should be taken in amounts appropriate to the heat, humidity and personal metabolic characteristics of the athlete.
FACT: Sodium chloride (salt) is indeed an important component of electrolyte replenishment but it does not fulfill the entire requirements. Calcium, magnesium, and potassium should be replenished as well as all these minerals play key roles in the maintenance of many important body functions. Additionally, body weight, fitness level, weather conditions, acclimatization level, and biological predisposition all greatly affect electrolyte depletion and the need for replenishment, which is why a "one-size fits all" bottled drink or drink mix usually won't work. Electrolyte depletion is widely variable, which is why the hourly Endurolytes dose can range from 1-6 capsules/hr. That being said, 2-3 capsules of Endurolytes hourly is a good starting point. Certainly there will be occasions when 1-2 Endurolytes will be completely adequate; on hot-weather workouts or races, it may be necessary to consume 5-6 Endurolytes hourly.