It doesn't. You work your life around it. If you're only taking one course you can probably pull it off, otherwise you're going to have a bad time. There is

It doesn't. You work your life around it. If you're only taking one course you can probably pull it off, otherwise you're going to have a bad time. There is a ton of lecture content, assigned reading, projects and tests -- much of it beyond what's available in the free udacity courses. I've been taking two courses/semester and it's a significant commitment. 40+ hours per week.