I cant remember who, but someone on the forum proposed that we see the long lucid dreams like you would see a movie, (only seeing the important parts) so something like getting in the car and riding to work wouldnt really be in the LD, but beeing at work would.

also, its very hard to belkieve that someone could dream for 100 years, if you did dream that long then how would you know that you had? for me if even in real life a year goes by I start forgetting everything that happend in the past year, so what I think is that the movie scenerio is most likely especially because obviously you dont sleep in dreams and sleeping is the way that we reset our biological clocks to percieve time.