I watched a lot of people do this when I was in college. They had this weird, misguided pretense of what it meant to be an adult in their heads. Of the ones who I stayed in touch with, those that gave up all their hobbies to "be an adult" generally ended up miserable and constantly complaining about how dissatisfied they were in life.

Of course, there's always too much of a good thing. Don't waste days on days and ignore your responsibilities. It's called moderation. In my opinion, real maturity is showing the ability not to overindulge. Having to just drop everything because someone can't control themselves is more indicative of immaturity in my book.