Binge Writing

When do you write? According to one Creative Writing professor, it is good to write when you think of an idea. In other words, don't wait for that "big chunk of time," but just jot something down. Take little snippets of time--15 minutes here, 20 minutes there--and get down your creativity. Otherwise, the idea will flee. She explained there is such a thing as "binge writing," like an alcoholic who goes on a drinking binge for 3 days. Is this kind of writing bad? Or should we be more disciplined in our art? I wonder...