Hi Dan,
It has to do with size rather than length. Use as an example this .wav
stopped at 13 seconds.
A .wav encoded at CD quality (44kHz, 16-bit stereo), size 5.21MB, plays for
13 seconds. Saved at radio quality (22kHz, 8-bit mono), size 668KB, plays
in full.
To increase the maximum recording time in the Sound Recorder utility:
Make sure your microphone is muted so it will not pick up sound.
Click Record, and then let Sound Recorder run for 60 seconds.
After Sound Recorder stops recording, click Save As on the File menu, and
name the file Blank.wav.
You can repeat this step once for each additional minute of recording time
that you want to add. For example, for a 5-minute recording time, insert the
Blank.wav file five times.