CKRA 96.3 Capital-FM in Edmonton is now running commercial-free from Nine to Noon on weekdays. Not as a jukebox, but with an announcer doing frequent short breaks.
Today it was Karl Douglas, in for Jake Taylor. Previously, she (Jake) had been all-nights on CFCW for many years.
In this market, occasional 90-100 minute runs of music without ads, was the most I was aware of previously.
Admittedly, I worked for a very successful Top 40 station that ran 7 hours every night without commercials, from 6:00 p.m. to 1:05 a.m. signoff. But that was small market B.C. in 1972, not major market Alberta in 2018.