Touch typing... I'm embarrassed to confess I'm still typing with just 4 fingers while keeping my eyes on the keyboard instead of the screen.
Although I doubt it would require 100 hours to learn.
I can type quickly through my own means but very inaccurately. In a recent fast-paced online game the other players assumed I wasn't a native English speaker due to all my typos. I was a Vim user for ten years and would constantly mash the wrong keys. After starting touch-typing a few days ago, I redownloaded the old Vimfx extension to control my web browser from my keyboard. It ended up requiring me to switch to a Firefox fork called Waterfox though, as the modern (post-2017) extensions have to rely on injecting Javascript into the page and don't work well.
Do it. You can learn in like 15 minutes a day over a few weeks.
But it's actually surprising on mobile how much easier a non-QWERTY keyboard is considering it's two thumbs and your thumbs are at the pinky areas most of the time.
It took me a few months on keybr honestly when I got a new, ergonomic keyboard. The problem with ergo keyboards is they're split at the middle and suddenly my left hand couldn't reach for what was on the right side like it normally would and I had never realized I was doing it "wrong" all this time.