75 minutes isn't far off, I can think of plenty of films that hover around the 80 minute mark, and Moffat wasn't lying when he said it'd be longer than 60 minutes. I figured around 75 would be what we'd get and I'm happy with that. Just hope it's a good episode!
Agreed today. I was only picking on Moffat's "feature length" and "quite long" comments.
It was never going to be any longer than 75 minutes; the filming block simply wasn't long enough to accommodate any more than that.