Digestion time varies between individuals and between men and women. After you eat, it takes about six to eight hours for food to pass through your stomach and small intestine.Food then enters your large intestine (colon) for further digestion, absorption of water and, finally, elimination of undigested food.he mean time of transit from mouth to anus for the group was 33 hours (meaning half the children had digestion times slower than this and half had digestion times greater than this).