“No conclusion whatsoever” is basically the scientific consensus on whether Dvorak has any effect on efficiency or typing speed. It’s hard to get good data because it’s hard to isolate other factors and a lot of the studies on it are full of bias or have really small sample sizes (or both).
To anyone thinking of learning Dvorak, my advice is don’t. It takes ages to get good at, isn’t THAT much better and causes a lot of little annoyances when random programs decide to ignore your layout settings or you sit down at someone else’s computer and start touch typing in the wrong layout from muscle memory or games tell you to press “E” when they mean “.” or they do say “.” but it’s so small that you don’t know if it’s a dot or a comma and then you hit the wrong one and your guy runs forward and you die…
That said, I’m also a Dvorak user and it is very comfortable and satisfying and better than qwerty. Just not enough to be worth all the pain of switching.
That’s impressive! It took me way longer to learn. Maybe a month or two? Even longer to feel really comfortable with it.