So I was really bored yesterday and tried speed running a mission from the Halo 5 campaign (specifically the one where you don't do anything lol) and my best time was 3:06. For the first person who beats it, (with proof like above) I'll send you a gold pack I've been holding on to for like...2 years now.
Let me get home and I'll try it. Clearly there's not much time save for an auto scroller like this, but there are some dialogue skips