'Hound Dog' took like twelve minutes. That's not a complicated piece of work. But the rhyme scheme was difficult. Also the metric structure of the music was not easy. 'Kansas City' was maybe eight minutes, if that. Writing the early blues was spontaneous. You can hear the energy in the work.
I couldn't run a tight schedule, and if you're any good at teaching, you get sucked dry because you like your students and you're trying to help them, but you don't have any time left to write yourself.
You recognize a survivor when you see one. You recognize a fighter when you see one.