Honestly, if you are fit currently, make your goal not to get fat. Accept that you will lose your tone and muscle mass. That's obtainable. If your goal is to get huge and cut or even maintain current fitness, you're setting yourself up for failure. It will be pretty much impossible to workout every day, and to work out more than once a week will take a significant effort.
In intern year, you basically have time for the hospital and one other thing in your life. For most people, that one other thing is family/wife/boyfriend/dog whatever. For a few others, it's a hobby, for others it's video games, for others TV, for others going to the gym.
But you cannot expect to be an intern, spend time with your family every night, work out, cook dinner, watch a TV show, and do personal chores all in a single evening. For the majority of the year, in the evening you will have about 1-2 hours for exactly one thing. Choose wisely.