it depends on alot of things...mostly your demands really.
if you are flexible with where u want to live and when u want to take the rotations then its much easier. if you are zoned in on certain rotations in certain places w/ certain doctors you are going to be in trouble.
i already have my 4th yr rotations all set up and i am a little over halfway through med3. its all in you and how aggresive you are.
but remember that, even when those who move you be kings or men of power, your soul is in your keeping alone. When you stand before God you cannot say "but I was told by others to do thus" or that "virtue was not convenient at the time." This will not suffice. Remember that.