i have just finished doing an astronomy animation for the big science competition. it had to be five minutes long. i story boarded it and got a friend to do the narrating. i didn't have long to animate it so i did it in 12 fps. i animated during the school holidays and did it in 10 days running. none of the shots were really taxing but one (8 or 9 planets had to be moved every photo for a shot of 34 seconds) took 2.5 hours. the whole thing took 9.2 hours to animate.
you can see it on