Around 3-10 hours, depending on the audio file and the Tasker. Every audio file is different: there could be more than one speaker, the transcriber may not be familiar with the accents, and there could be unfamiliar jargon or acronyms being used. Moreover, you may have a detailed format that the Tasker needs to follow. You can include details like these in your task post so that you can narrow your search down to Taskers who are familiar with your industry and the speakers’ accents.