After normal procedure: approximately 1 hour to rest, and clearing the air from your colon after the procedure. In so far as the colonoscopy proceeded without complications or major interventions, the patient may start ingesting lighter meals.
Major surgeries (electroresections of polyps …) require a 24-hour hospitalization for safety reasons. During this time you may only drink fluids. For the next 7 days at home you may only ingest light, overcooked food (potatoes, pasta …) and unlimited amounts of fluids. It is recommended to rest (avoid major sporting activities, or lifting loads that weigh more than 3 kg).
If the procedure is followed by abdominal pain, stiff abdomen, fever, a larger amount of blood in the stool (1/2 dl) when you are already at home, you should immediately notify your physician or emergency doctor.