It's my understanding (hedge word for "not 100% sure") the whole "22 minutes" thing dates back to the mid 1960s... Gordon McLendon was launching a near-clone (with some adjustments) of his WNUS Chicago on Tijuana's XETRA for Los Angeles... XETRA was to be very commuter-friendly, and when a recent study came out estimating the average daily commute to work in the Greater L.A. area was 22 minutes, he set out to develop a news cycle that would hit everything in that time... That's what, I'm pretty sure, the 22 minutes refers to (it has nothing to do with programming cycle)... Later Group W adopted the positioner for its own news stations, which of course all sound very different from the early McLendon ones (few if any reporters, just good announcers reading mostly wire copy and stuff from very few writers)...
After reading Fred's post above this morning, I punched up WILM's stream to hear much of the 11:30 "hour" and must say his comments are pretty accurate... Granted I didn't log on until about 11:40 or so, but all I heard was a very lonely-sounding Mark Fowser reading wire copy, a National Wx Service (!) forecast, and playing spots (and a lot of unpaid PSAs, which I suppose could have been on the stream only-- then again, I heard what likely was union talent on other spots that went out over the stream, so who knows)... I don't even know why they're doing this half-hour... Radio Programming 101 teaches not to start radio shows on the half-hour, though I doubt Watson shares much audience with Rush anyway...