Every creative who leaves a day job to pursue their craft professionally is blindsided by a plague of time. No one ever sees it coming and no one ever warns you about it.
The same thing happens to high school graduates who go onto college. One day their lives are regimented from dawn to dusk with school, sports, homework, and chores. The next day they have a few classes and untold hours of free time that no one taught them how to manage.