He studied Chinese daily for four years prior to giving that talk. Studying a language daily for four years suggests determination and willpower, yes. But I w

He studied Chinese daily for four years prior to giving that talk. Studying a language daily for four years suggests determination and willpower, yes. But I would expect most people who have studied a language daily for four years to be able to give a talk in that language if they needed to and knew ahead of time. I'm not sure that's a non-average learning time.