Earlier quoted context omitted.
Learning to touch type took roughly 10 hours over 2 weeks, and it made my life immeasurably better. Your (dad's?) mileage may vary.
What exactly improved?
If you're really curious, just learn to touch type and find out. It doesn't take all that long if you're already a solid typist. I'd be fascinated to read an article from someone who learned how to touch type and thought it was a waste of time.