Niji, that all depends on

Niji, that all depends on how much feedback you may get. It is possible to have a 2 hour presentation and have feedback the whole time. For your video, it is possible for people to sit through some pretty bad video, most will not sit through bad audio. Read that here more than once and have stopped watching shows with bad audio. Personally, if you do not know how to do audio, I would get someone who knows how.