Age would be another factor as some only need 600-800 cals a day. Your chicken soup is also not a really balanced meal.
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Reminds me of...Keep it boiling over the fire. That's what the pioneers did - they kept a pot of soup boiling all the time and kept adding things to it, and eating out of it. Palatability goes down after a while, and you can't do this well while traveling, but you won't get food poisoning.
Age would be another factor as some only need 600-800 cals a day.
No I was thinking of adults that weigh from 90 lbs to 290+ pounds. A skinny 18 year old adult to a pro football player. 3 days still might be a good average.Are you thinking of children? The OP did say "adult."
Children are more complicated because they are often smaller (need less food) but growing (need more food than an adult of the same size would need). Teenage boys seem to need the most, because they are already as big as some adults, but also growing quickly.