Sounds like one of those monotonous-but-simple-enough-to-do things that I'll save for when I'm watching TV or a movie and don't need to give the DS my full attention.
If not for areas like that, I would say that would be an almost unreasonable goal. But then again I got 999999999 Bells in Animal Crossing as well as Animal Crossing: Wild World, so it'd be hard for me to call it unreasonable anyway. It's only a thousand, not a billion.
(The Animal Crossing (animated) movie came out in Japan just over a week ago and a live-action Hollywood Castlevania movie may come to pass in a year or two.)