During the period I worked at Meteor Studios, we were primarily vending to Discovery and TLC, with the occasional National Geographic show thrown in.
I was tasked differently on some shows, but the experience ran the gamut from straight and simple design tasks all the way to full-on art direction and some animation direction when needed. (In the case of dinosaur shows, especially.)
Often, I had to work about 4-5 shows at a time... I'm not sure how I actually survived!
Images: Discovery / TLC / National Geographic