"On a V100, it takes about 3 hrs to fully sample 20 seconds of music."
That might make building off this project out of reach of the average engineer (you certainly cannot build that into a Colab notebook), although that necessary amount of compute is not surprising.
I would guess that on average, it takes a professional more than 36 hours ((4×60÷20)×3) to make a 4-minute audio track with original music based on given lyrics.
Speaking from my own experience, I’ve had tracks that took months to complete, and I’ve had tracks that I got to probably 90% completion in under an hour. I would propose that there’s no meaningful definition of “superhuman” for creative efforts.
It’s impressive that now, they “only” need to improve the quality for it to outcompete professional musicians on commercial delivery.