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It usually takes from 24 to 72 hours for healthy people to completely digest food and eliminate waste products. The first stop for food is the esophagus, which moves food from the back of the throat to the stomach. About six to eight hours after eating, food passes through the stomach and small intestine.
  It usually takes about 4 to 6 hours for a full stomach to digest the food. However, this varies from person to person, and if vomitting occurs, much less time.It takes â¦ from 12 to 24 hours for the food to completely leave the digestive/excremetory systems.7 people found this useful. It usually takes about 4 to 6 hours for a full stomach to digest the food. However, this varies from person to person, and if vomitting occurs, much less time. It takes â¦ from 12 to 24 hours for the food to completely leave the digestive/excremetory systems. 7 people found this useful.