Learn a skill to a decent level in 40 hours is only possible if the skill is simple, for instance, playing a few chords on a ukulele. I'd love to see someone l

Learn a skill to a decent level in 40 hours is only possible if the skill is simple, for instance, playing a few chords on a ukulele. I'd love to see someone learn the piano, the violin, or classical guitar. Or jazz improvisation. Or oil painting. Or ballet.