In a world where the Hustle is glorified, it can be easy to work 24-7. How can I tell the difference between a healthy hustle or a problem with Workaholism (AKA Work Addiction)?

In a world that never sleeps, we can literally work 24 hours a day (and there are even some professions where this is literally required).

So, what is the difference between a strong work ethic and a pathological one?