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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.
up vote 9 down vote accepted. It takes 30 to 40 minutes for food to digest in your stomach and 3 to 4 hours for it to absorb in your intestines. I agree that there is no strict formula for this, since it also depends on what you eat and how you intend to expend that energy. From my experience if I eat a large meal which is heavy in carbohydrates I see my best performance with a high intensity exercise 6 to 8 hours later.