If you eat 30g of protein (whey) it might take around 3 hours to digest. If you ate 100g of protein (whey), then it would just take longer to digest, say 6 hours.As a side note, everyone thinks that whey is a fast protein, and it definitely is, but they underestimate how long it will actually take to digest.f you eat 30g of protein (whey) it might take around 3 hours to digest. If you ate 100g of protein (whey), then it would just take longer to digest, say 6 hours.