I started around 11:30am, and I finished around 7:00pm. That includes the building, the moving of the old bookcase, the cleaning and moving of the fishtank, the reshelving, the vacuuming, and the near-fatal moving of the big bookcase over the bed and nearly on to my head.
But, it is done. And I think they look pretty good, if just a little too big for the room. But then again, the bedroom is tiny, and anything you put in there is going to instantly look too big. (Dirty!)