Transcription software speed shifts really neatly. I work at 60% of regular speech speed which provides a typing speed (if the audio is nice and clear) of 80-ish WPM. Also, it’s nice audio and the context will help out. Basically, if you’re working on pro transcription software, that will read like normal speed speech. Also, if you’re typing for someone like C4 (I’m not sure if Red Bee do theirs or if they have an in-house team) then you’re going to have fairly deft ears.