This works well if you are in your early 20s or otherwise have no real obligations, but otherwise it becomes very untenable unless you are ruthless about carving out that time, and the other people in your life are accepting of that prioritization.

The best I can do is try to carve out a couple of hours late at night or early in the morning, when everyone else is asleep. But you end up robbing Peter (sleep, chores, exercise, cooking, time with loved ones) to pay Paul.