An average person's day consists of work, house labor, and hobby (may be what I really mean is leisure instead of hobby).  Yes, the lion's share of our conscious time is spent doing these three things above, and then we die. 

But that depends on how you define hobby.  Well, how do you define hobby?  The authors of Freakonomics define it as "something you do without being told to do [outside of work]."  I have a slight problem with this definition, because no one tells me to brush my teeth but I wouldn't call it a hobby (may be house labor).  I guess you can refine it by saying, "something that you do for fun, relaxation, amusement or achievement, though you are not being told to."  By this definition, it's pretty much everything else besides sleep, work, and house labor. 

So what is your hobby?  Unfortunately, mine is facebook and cyworld.  Yes, facebook and cyworld.  It's grim and pathetic, but it's true.  Friends, that is how I spend most of my leisure time, on facebook, nate.com (another name for cyworld), and skype.  There is a good reason why I haven't had any magnificent accomplishments lately.