If you are working in the (American) animation industry you should be able to pump out at least a minute of puppet animation a week, or 25-30 seconds of hand drawn. I had one project at the end of last year where we were trying to crank out 3 minutes a week per person.
Nobody ever warned me about this. But it has been my experience consistently. It is a good idea to get fast.
That said: how long does a thirty second animation take?
If it's taking you more than 3 weeks your probably doing something inefficiently.
When I'm working on something and I want to crush it:
3 hours per background
2 hours per character design
4 hours per character rig
.5 hours per environmental object rig
1 hour: per animated element per second
2.5x modifier for perspective shifts.
(where an animated element is either a particle effect or a character)
3 hours per background.
1 hour per second of animation rough per dynamic object
2 hours per second of cleanup/inbetween per dynamic object