28 WPM, one thumb, portrait mode.
I know I'd register as faster if I didn't need to shift focus back and forth. Likewise, you get in a zone where you just "trust the autocorrect", and let it fix the crazy non-words you end up typing when you go for speed. This isn't represented in the app at all, even with the basics. AFAIC, on an iPhone, the proper way to type "iPhone" is "iphone".
It's been awhile since I've taken a test on a full size keyboard. I'd guess I'm somewhere between 40-60 WPM.