Yup. I started up Stepmania, loaded the 8th DDR mix, and played Endless mode until I completed it. That's where you have to complete every song in a set consecutively, with no rest, and only 4 "lives" (1 of which you lose each time you fail a song by making a few missteps). There are 73 light difficulty songs on the 8th mix, and when I started, I really, really sucked. (If you are perfect and fail no songs, it takes roughly 2 hours. And I don't know how to pause it, if that's even possible.) Hence, 8 hours.
Also, yes I have revenue sources, but not what most people would call a job. To me the defining characteristic of a job is that it is an activity in which you trade time for money; usually your time for somebody else's money. By that definition, no, I do not have a job, as it would be the least efficient way to provide for my "needs". I "work" (for purposes of brevity let's make this one 'activity undertaken the consequence of which is ultimately the accumulation of financial resources') less than an hour a day, on average.
However, I am also a full-time student, and have quite a few time-consuming hobbies (contrary to the impression the volume of my e-babbling might give any reasonable person
). So it's not that I had 8 hours to spare so much as I had to spare 8 hours. 
I can't really walk away from a perceived challenge. It's a character fault. Even the smallest surrender of the will is a great death of the spirit, or something.