A few years ago I did an analysis of some popular political talk shows on the radio, to figure out how much actual content each hour contained once you remove the ads, the news etc. Often it was as low as 20 minutes. If you took into account recaps after each break it got even lower. On the HSS, if you take out the ads, the news, news with Robin (he does chime in here sometimes), personal endorsements, precanned funny bits, playing bits from older shows, music, other clips Howards share is down to 10 minutes at times. That is not an average though, since sometimes during interviews he might do 30 -40 minutes straight. he has done longer sometimes. I havent analyzed enough shows yet, but I believe the average is around 18 - 25 minutes.