The idea occurred to me today, is it possible that TV shows on DVD are time compressed. I had heard about time compression years ago but never researched details about it. So I had thought it was only a very short reduction in time without removing content. But today I decided to do a little research using google search and found a link to an excerpt from journal of marketing research Vol. 17 No. 1 from Feb 1980. It describes that it is possible to time compress a 30 second commercial to 24 seconds. This is a 20% reduction in duration. I then Ran the math and the same time compression rate on a about 25 minute program would reduce the duration to about 20 minutes without loss of content. Seeing as I have been recently watching shows on DVD and IW from the 70s and 80s that appear to be edited based on each episodes run time it would appear they may have time compression. However from more research using google search I found mentions that there is no reason to use time compression in a DVD release. So it has me wondering why would they be time compressed?, assuming that is the reason for the shorter run time. Which I'm still inclined to think they may be edited (missing content) vs the original airing. If the episodes run times matched closely with their original airing run time then I would have little reason to suspect what I'm watching isn't what was originally aired. I figured I'd post my thoughts and see what everyone else thought.