(approx. time spent in stomach before emptying)

Water
when stomach is empty, leaves immediately and goes into intestines

Juices
Fruit vegetables, vegetable broth - 15 to 20 minutes.
Semi-liquid
(blended salad, vegetables or fruits) - 20 to 30 min.

Fruits

Watermelon - 20 min.digestion time.
Other melons - Canteloupe, Cranshaw, Honeydew etc. - 30 min.
Oranges, grapefruit, grapes - 30 min.
Apples, pears, peaches, cherries etc. - digest in 40 min.

Vegetables

Raw tossed salad vegetables - tomato, lettuces, cucumber, celery, red or green pepper, other succulent vegetables - 30 to 40 min. digestion. -

Steamed or cooked vegetables
Leafy vegetables - escarole, spinach, kale, collards etc. - 40 min. - Zucchini, broccoli, cauliflower, string beans, yellow squash, corn on cob - all 45 min. digestion time
Root vegetables - carrots, beets, parsnips, turnips etc. - 50 min.

Semi-Concentrated Carbohydrates - Starches
Jerusalem artichokes & leafy, acorn & butternut squashes, corn, potatoes, sweet potatoes, yam, chestnuts - all 60 min. digestion.

Concentrated Carbohydrates - Grains

Brown rice, millet, buckwheat, cornmeal, oats (first 3 vegetables best) - 90 min.
Legumes & Beans - (Concentrated Carbohydrate & Protein)
Lentils, limas, chick peas, peas, pigeon peas, kidney beans, etc. - 90 min. digestion time
soy beans -120 min. digestion time

Seeds & Nuts
Seeds - Sunflower, pumpkin, pepita, sesame - Digestive time approx. 2 hours.
Nuts - Almonds, filberts, peanuts (raw), cashews, brazil, walnuts, pecans etc. - 2 1/2 to 3 hours to digest.
Raisins - 45 minutes to an hour

Dairy

Skim milk, cottage or low fat pot cheese or ricotta - approx. 90 min. digestion time
whole milk cottage cheese - 120 min. digestion
whole milk hard cheese - 4 to 5 hours digestion time

Animal proteins

Egg yolk - 30 min. digestion time
Whole egg - 45 min.

Fish - cod, scrod, flounder, sole seafood - 30 min. digestion time
Fish - salmon, salmon trout, herring, (more fatty fish) - 45 min. to 60 digestion time

Chicken - 11/2 to 2 hours digestion time (without skin)
Turkey - 2 to 2 1/4 hours digestion time (without skin)
Beef, lamb - 3 to 4 hours digestion time
Pork - 41/2 to 5 hours digestion time

Source: http://www.freetrainers.com/FT/jsp/M...ix=3&t_ix=3122

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I'm quite surprised at the digestion time of pork, I always thought beef took the longest to digest