When we first got Yusuke, my boyfriend (now husband) had a full-time job but I did not. It was very helpful in terms of training that I was able to be at home with him to crate train and potty train, especially since we got him at a younger age than anyone should be getting a puppy. When he was about 4 months old, I started a full-time job and we made sure one of us came home to let him out at lunchtime then we played with him EVERY NIGHT. We would always play fetch or walk/jog for over an hour with him. And his energy still barely let up. Lucky for us, our apartment complex had a fenced-in "dog park" where we could give him proper exercise. Without this convenience, having him in an apartment would have been harder. And when we finally got a house with a fenced-in backyard, it made our lives that much easier still. So if you have the time, patience and willpower to have an ACD in your apartment, it is manageable. But it is definitely not easy.