Re: 50th Is "The Day Of The Doctor" (And Is 75 Minutes)
As far as the 75 minute length vs. classic series multi-Doctor episodes, those classic eps could do quite a lot of dragging on.
If they pack a lot of action into 75 minutes, it'll be good enough.
Rimmer, on what period of history to live in-
“Well, It’d be the 19th century for me, one of Napoleon’s marshals.
The chance to march across Europe with the greatest general of all time and kill Belgians” - (White Hole).