This is a community forum with answers from other subscribers. No one from Comcast is here to help you.
This is not the Comcast help desk. I suggest you call Comcast support at 1800comcast, but it is unlikely they will know the exact details on the show since the Biography channel supplies the show to the On Demand servers for viewing.
You are probably better off contacting the Biography Channel to find out what show they are feeding to On Demand.
The BROADCAST version is 2 hours. I guess the OnDemand version is only 90 minutes because it does NOT include commercials. And yes, that is about normal (A 60-minute show will typically have 15-20 minutes of commercials.)
Just for fun I found Jeff Dunham on Bio in On Demand.
It does indicate that the show is 120 minutes. This is incorrect.
I used fast forward and got almost to the end of the show. What I saw were the credits AND that I was watching the 1 hour 30 minute point. After the credits, show over.
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I have noticed that many OnDemand shows have the wrong length. They often list the broadcast length and not the actual length. Top Gear for BBC America is another example. It says 60 minutes, but is actually around 45 or less.