This will usually take 5 to 6 hours. The food then enters the colon for further digestion and water re-absorption before defecation. The time from it's entering the colon to defecation is about 12 to 24 hours. Thus, the time for food to travel from one end to the other probably ranges from about 20 to 30 hours.nswer 1 It depends on what you have eaten. Some foods (such as food with poor nutrition-ie junk food) digest fast while others digest slowly. On average it takes about 2 … 4 hours to digest your food completely, ready to pass out the other end. Sometimes this can extend to 30-48 hours.