Thinking of absorption rates and whatnot is in my opinion a waste of time. People have gotten stronger, leaner, or bigger without this knowledge for thousands of years (whether or not they were trying to). Treat protein as any other macro nutrient/calorie.
The concept of absorption when dealing with protein is to open ended for it to get you anywhere. You don't poo the remainders out if you over stepped the 20, 25, 30g "rule." Some bodies burn it for energy to fuel organs and to repair damaged tissue and other will store it as energy/fat. It depends on the metabolism of your body, your physical/mental streses and a bunch of other stuff and simply how much you consume v.s. the needs of your body.