The most shocking revelation to me in this article is that Sirius XM plays 13 minutes of commercials per hour! I could have sworn one of their big selling points was that they're commerical-free.
How rude of you! They are 100% commercial free- 78.3% of the time!
Most of their music stations are commercial-free. The news/talk/entertainment/etc stations have tons of commercials, so perhaps it just averages out to 13 minutes/channel.