That depends on many factors, including your typing speed. However, the industry standard is 4 hours of typing for every 1 audio hour. That may be higher or lower depending on the details. In addition to your own typing speed, another big factor involves the quality of the audio. If you have a clear recording and the speaker is talking slowly, you may be able to do it much faster. Or if the audio quality is poor or the speaker is talking very fast, it may take more time.