I think we chatted briefly online in the past that you have some experience with transcription services.
I do type 150-plus WPM on a keyboard. When people converse, the colloquy can range anywhere from 180 WPM to 275 WPM. In order to be certified as a court reporter, one must be able to stenotype 225 WPM for normal colloquy and 275 WPM for jury charge. Typing/transcription is a different animal, though. I am fortunate that I have the capability to do both.
Recently, because of another thread, I actually did a little research on who is the fastest typist in the world (on a keyboard, not a stenotype machine).
According to Guinness Book of World Records, it is a lady named Barbara Blackburn from from Oregon who was clocked 212 WPM. However, the keyboard she used to type this fast is not the same as the traditional keyboard most people use. It is called a "Dvorak," as depicted below. You can see how the letters are moved to different places on the Dvorak to assist with speed, I guess. Here's a link about it:
http://web.syr.edu/~rcranger/blackburn.htm
Interestingly, Barbara Blackburn, the fastest typist in the world, can maintain 150 WPM for 50 minutes on a traditional keyboard, and so can I. That's 37,500 keystrokes, BTW, in a 50-minute period of time.
Since math is not my best subject, I was trying to figure out how many keystrokes that is per minute, but I came with a blank!
Many moons ago when I worked downtown full time, I never did meet a transcriptionist who could type as fast as me. There were a few good ones, 120 WPM, et cetera, but none who could bang as many pages per hour as myself. Of course, in my business, it doesn't matter how fast you are or how well you type. The most important goal is to be on time with the delivery of the transcript! In the end, that's all the client cares about!
JAM