8 hours shouldn't be a big deal. Protein is your best friend, avoid anything with sugar, even dairy sugars and don't go for a protein bar. If you can, cook 12-16 oz chicken breast in some olive oil and eat that with some brown rice or whole wheat pasta. Have some veggies on the side.
If you need a more breakfasty type thing, best thing I can reccomend is a 100% whole wheat bagel SMOTHERED in peanut butter. Add a banana if you want. This is so filling, and the banana shouldn't cause the even minor sugar crash because of the fats and whole grains. Eat two of them if you want, you won't be hungry for 8 hours after that.