I've only just oderd mine recently and it was posted on Saturday. So I should have it tomorrow, but, it will have sound added. And Im almost certain it is longer than 4mins. I'll give more info when I've got it. The DVD has footage from the following shows
Disc One:
Chapter 1: Las Vegas 12/5/75
Chapter 2: Las Vegas 12/3/76
Running Time: 65 mins
Disc Two:
Chapter 1: Las Vegas 12/4/76
Chapter 2: Las Vegas 12/8/76
Chapter 3: Las Vegas 12/12/76 (Closing Show)
Bonus Chapter 4: Las Vegas Opening Engagement 1969 (Best quality anywhere!)
Running Time: 60 mins
Based on the timings given we can be fairly confidant that it has more than 4mins of the show. Although I might be wrong.