WAHAHAHAHAHAHAHAHAHA. This actually happened to me, three weeks ago.
The animation seems to have taken me four hours and 35 minutes. That was with losing a frame at one point though ...
Beware: if you click 'New Animation' (which I tend to do by mistake instead of clicking 'New Frame'), it will lose your work - even if you cancel the dimensions dialogue. This happened when I first tried the program out, and I lost the whole animation. It happened twice today, but this time I was saving frequently; I lost nothing the first time, and I lost one frame the second time. It could have been worse.
Oh, and I highly recommend animation if you want to practise getting proportions and perspective right. It forces you to see the errors and fix them.