Those number aren’t that far off. The best you can do is maybe 2 or 3 x runtime with a 2 pass VBR encode. Burning shouldn’t take that long. 1 hour max
There’s isn’t a facility in the work that could deliver this is less than a 7 or 8 hours
I encode without audio all the time. As long as your audio matches your source video, it should be fine. Find out why they are encoding and authoring with
The real question however is why is this being discussed 24 hrs ahead of the deadline? 🙂