If you want to talk about deadlines, demands, and commitments...
Back in the 90's I took a few evening courses at the Joe Kubert Art School. This is an institute where graduates go on to work for comics- Marvel, DC, Disney, etc.
One of my professors, Mike Chen, drew for The Muppets when they had a daily strip.
Even just taking one course, I was pulling a few all-nighters a week.
For the full time students, the demands were greater. The advantage was the teacher/student ratio was 1:8. Very small classes, so you got a lot of attention. But homework was intense. It was a three year course, having a job was out, having a social life was out, it was three years of boot camp.
Because they knew if you wanted to draw for the comics, draw the next (for then) Swamp Thing or X-Men, you better get ready because the competition is gonna be cutthroat. And you need that discipline because you gotta compete like you can't believe to survive.
Mike Chen once told us something Chuck Jones's instructor told him.
"You have about a hundred thousand crappy drawings in you. The sooner you get them out of the way, the better off you'll be. Then you can get serious".
If you want to succeed in anything, get ready to put the time in.