"Real food" will definitely digest more slowly than whey. I'm not so sure about micellar casein. A few things came out of the boire study.
1. Whey emptied within and hour and amino levels rose and fell off within two hours.
2. In this whey only meal 40% of the aminos were metabolized in the liver for energy.
3. Micellar casein elevated amino acid levels for up to seven hours and demonstrated a strong anti-catabolic effect.
Micellar casein is slower digesting for two reasons.
1. It formed a gel in the stomach slowing gastric emptying. Beef will leave the stomach in 1-2 hours.
2. Casomorphins in the micellar casein slow intestinal motility. It's so effective at slowing motility that it will stop diahrea. The longer the protein stays in the intestine the more will be absorbed.