If I remember right, its 4 hours long. no need to cram part 2 into the 1st movie, when it's long enough to be both.
I haven't watched it yet, but I feel like if anyone at WB had real faith in this, they'd released it as 2 separate movies instead of blowing the wad all in one.
or they would have kept it as the 4 part mini-series and drawn in more subscribers