Four ounces of protein is 113.64 g, or roughly the amount of protein contained in a 16-ounce steak. I wouldn’t be totally surprised to learn that the body can’t assimilate more than a pound of steak at a time, but I’ve never heard that before, and I too would like to know where that idea comes from.
Nevertheless, that amount of protein daily would be high for most people. We generally recommend eating in the neighborhood of 1.0-1.5 g/kg of lean body mass/day, so that amount of protein would equate to 75.76-113.64 kg of LBM. Assuming 30% body fat would imply a total weight somewhere between 108.23 kg and 162.34 kg, or 238 and 357 lb.
Still, the numbers aren’t wildly out of range. 
