An average adult with an average burn would take one packet (sachet; dose; shot) one day, and a second the next day.
However, it depends on what the situation is and how big the body is. A large person could take more, and someone who has a more severe burn could also take more. We assume the person is an average size adult with some redness and pain. Judgement must be used. If a body is very badly burned, medical attention should be sought – especially if it is a child or a baby.
Sunburn Drink is made up of natural nutrients and it is unlikely one could overdose on it. However, Sunburn Drink does not replace medical attention where that would be appropriate.