I type for a living on a voice recognition system that handles medical reports for a large university hospital in a major metropolitan area in the Southeastern US. I can achieve an effective rate of 300-400 69-character lines per hour using a word expander program called Shortcut for Windows while editing voice recognized text. If our physicians are well scripted in their dictation, using the same phrases and format as usual, I can easily double that as I learn where the VR usually fails, move to those spots quickly, make necessary changes, then quickly verify the reports matches the audio with a listen in high-speed playback.
Some of our reports are typed in toto and I can average about 250-280 lines per hour if I use word expansion macros, usually 3-5 character mnemonic abbreviations that expand into difficult to type words, often used phrases, and even whole pages of boilerplate when necessary.
I do fairly well, but the transcription industry has been whittled away by substandard work delivered by overseas workers who are willing to work for half of what we used to make, and all the good shops are being bought up by big transcription businesses that love to ship work to overseas employees, if they can get away with it.