A more general rule of thumb:
Is this action or activity taking me closer to my goals?
If no -> quit
If yes -> can you be maximizing the value you're getting from this activity? By switching up your approach somehow?
It's like in business, where you should always direct your focus and effort towards the activities which are creating money.
@Locomike
Good point, if you think of the things that drive you and inspire you as soon as you wake up, you're gonna naturally want to get up quickly because you're so excited about what to accomplish in the day
I recommend you read
"The Education of Millionaires by Michael Ellsberg"
It will aid you in your decision by showing you what's possible and realistic and it'll dispel any preconceived ideas about college's value which is preached by society.