I was 60wpm on qwerty; I'd taken a couple of classes several years before, but I hadn't done any practice drills or anything since, just normal typing. I didn't do any specific training; I just typed a lot (it could easily have been nanowrimo or similar, I don't remember), alt-tabbing back and forth with an onscreen layout diagram when I needed to. I agree that it sounds insanely fast, but that's how I remember it going.