RE: Protein Absorption
We still don't know what the exact amount of protein one can absorb in one sitting is. There are quite a few factors affecting the amount on top of it.
Some of these factors include: bodyweight, time (demand is higher post workout for example), source of protein, etc.
The thing is, amino acids are not stored in the body. The body can store "fat" and "carbs", not protein. Now...the body is in constant demand of amino acids but it can't store them, that's why you should be providing the body with "protein" frequently throughout the day and not all of it in one shot because the extra amount (whatever that may be) will not be stored.