If I had one extra hour per day to do something, I would read more. I always told myself when I graduated that I would continuously be reading a book, now that I didn't have to do it for class. I have been doing pretty good, I've finished the entire Harry Potter series and the Twilight series. But I know that there is more writing that could be done, if I just made it more of a priority.
But some days, however, I think are long enough and don't need an extra hour. For example, all mondays. These should actually be made shorter, because Mondays are rarely good days and should be as short as possible. :)