How long does it take to raise a holstein calf to 400 lbs feeding cracked corn and alfalfa pellets?

Such a generic term can lead to very skewed calculations as to how much grain is needed to raise a calf to the lucky number 400 lbs. What if that calf is already at 400 lbs and the questioner doesn't even know it? Breed, age, current weight, type of grain being fed and if there is other feed being fed (i.e., hay, silage, grass) are all things that must be known first and foremost before this question can possibly be answered.