I was interviewed for a 5-minute TV piece once. (I was one of several people interviewed. The clips from my interview made up about 30 seconds in the final cut.) Since I had the chance, I asked the producer for an estimate of how many hours of work go into the piece. She did some back-of-the-envelope estimates and finally settled on 80 hours, across research, scheduling and conducting interviews, obtaining footage, editing, voiceover and communication between all involved parties.
So that would be 16 hours per minute of airtime, although admittedly that particular format was higher-than-average production quality.
I also have some personal experience producing scripted podcasts, and there I have about 0.5 hours per minute of airtime. It's a lot less work since I'm doing it as a single person and I don't have to care about video.
When you're saying "1 hour per minute" for video content, I actually find that incredibly efficient.