Please Scroll Down to See Forums Below 
it takes a good 30-45 min to drink one of those. so its not all at once. They can also be split up at half one hour and half another hour later. As far as carbs, thats why i suggested all the oats and rice with each meal. along with the shakes that should put him in the 500g carb range. And for gaining muscle...why would you want less protein? 2g per pound of body weight. period. Red meat builds muscle and mass better than any other meat. Not to discount chicken, fish, and all the other great stuff we eat. Red meat isnt the cleanest of them all. But I would say its alot more powerful at building mass than birds and fish.
At his weight and size no, he probably couldnt absorb 90g protein at once. But as he gets bigger and especially with aas use he will be able to absorb more at once. Besides, with the shakes, the fats in the natty PB will slow absorption. Just like eating fatty nuts (fatty nuts
) with meals will do. I dont think twice about eating a good 75g at once (when not cutting)
