For a regular person, it takes around 4 to 5 hours to transcribe one-hour audio. It takes about one hour to transcribe audio of 15 minutes, and that also depends upon the quality of the audio. However, a professional transcriptionist can transcribe one-hour audio within a span of two hours. Professionals can complete this process very fast, and they can transcribe audio of 30 minutes in an hour. Therefore, if time and scale of work are of utmost concern for you, it is better to rely on medical transcription services.