I've had to quit listening to KTUC as often because certain songs get played every single time I listen. I like the songs, but at some point too much is too much. And there are lots of songs a station like that should be playing that I haven't heard. Maybe I should go back to WERT periodically even if they play some songs I don't like.Sean Ross just wrote a column about song repetition in radio.
Sean's column is more about song scheduling than playlist size. But he notes that some recurrents are "burned to a crisp" by the time they move out of the current rotation. My view is some of that is because some currents in heavy rotation weren't actually hits.
But the Facebook group I belong to has YouTube videos that last all day.