Hi, Solomin. It depends on what you eat, and what it is combined with. When I eat grapefruit or raspberries for a snack, it moves through me within three or four hours. If I have a ham, cheese, tomato and cucumber sandwich for lunch, or dinner of chicken with a carb and vegetable, it will take longer, maybe six hours, or overnight. If I have pasta with only vegetables, it is faster. Fruits digest very quickly so maybe try to eat it on an empty stomach so you can absorb its nutrients.
Try to food combine and see how your system processes certain food combinations: Soft, soluble vegetables such as squash, pumpkin (try canned pumpkin, add some spices for flavour), peas, spinach, or zucchini with rice, sweet potato, or pasta take approximately the same amount of time to break down, and be expelled. Meat takes longer to break down, so if you have meat in the meal, eaten with soft vegetables or fruit it stops up the rest of the food and takes a bit longer, or harder to exit.