When using the IV system to process audio or video, the processing requirements are based on the total duration of the audio content.

After importing data into IV, the duration of files can be seen on the Import report in the JumpTo web application, and the total duration of audio in a group can be seen on the Processing report.

Using the IV API, this information can retrieved with the /imports and /groups endpoints.

Calculate audio duration before import

Using Microsoft Windows

Select the audio file in Windows Explorer, open the context menu (right click or long press) and select properties.

The duration is shown in the Details tab under "Length".  If you select multiple files, the total duration will be shown.  This works even if the files are different types as shown below:

Using Linux

Using the ffprobe tool which is included with ffmpeg (and installed with IV) you can see the duration of a file using this command:

ffprobe myfile.mp3

You can also use this to calculate the total duration of many files.