Oddly enough, the larger an animal is, the less food it generally needs relative to its body mass. “Kleiber’s law” basically says that an animal’s energy requirements increase more slowly than its body mass. A rex would have had enormous absolute energy requirements, but could likely have survived considerably longer than a week without eating.
One month? After one week, something is dead unless there’s plentiful food.
Oddly enough, the larger an animal is, the less food it generally needs relative to its body mass. “Kleiber’s law” basically says that an animal’s energy requirements increase more slowly than its body mass. A rex would have had enormous absolute energy requirements, but could likely have survived considerably longer than a week without eating.