I think this is a highly individual number, based on type of protein eaten (which would make a difference based on rate of digestion...), the timing of the ingested protein, and the size/weight and metabolism of the person eating it.
83kg, hardgainer, I drink 500ml skim milk after every meal (except pwo shake), giving me an extra 25gm with each of my 4 meals per day (the pwo makes up the 5th meal). I do this because it's not very feasible for me to follow the "perfect" diet, ie chicken twice per day. I'm wondering if, with my meals that have about 30-40gm protein, is the extra milk protein being turned into fat? I want to cut right now but I want to keep usable protein to a max to maintain my muscles.
There is no set number or any evidence that your body can only absorb x grams. It's pretty much just speculation and theory. Generally I don't exceed 50 grams in a meal, purely because I spread my intake throughout the day and do not need loads at one given meal.
Heres what your minumum should be. Your Body Weight/6-8(depends on how many meals). Example, a person 200 lbs who eats 6 meals a day should get ATLEAST 33 grams a meal. as for total I wouldnt do more than 50-60.