Originally Posted by Angamb
Just go back to any of the original movies, and see all the scenes that enter on those 40 minutes.
Well you could also put it like, go back to the original movies and imagine that the whole movie and its story line is condensed to 40 minutes. Or that you watch 40 minutes of the movie and then just stop. I imagine that neither would be very satisfying.
If you have two story lines in two different time periods with two different casts that do not intersect, you in some way have two different movies in there. There's a danger that neither of them gets enough development.