How long can a body go for without food or water

Usually up to a week then you start hallucinating and slowly die because your body depends on food for energy

Along with the credits thing it could also affect your health in a type of way. you need to get out the house or off the computer and interact with people. if you stay taking online classes and are not going outside and socializing that could affect your health or your mind. your mind will start to form into you being alone and you would want to be alone over anything. so public or private school would be good because there is people around you to and support you.