Distance or duration, a finish time or pace, and how much you sweat. You will see the hourly targets and the first hour before anyone asks for a card.
Race Fuel Planner is not medical advice and is not a sweat test. The numbers are estimates from what you typed. Practice any new amount in training. Stop for chest pain, confusion, or swelling. Drinking far beyond thirst for many hours can dilute blood sodium. If you have a health condition, talk with a physician before you follow this.