Hi Bill,

Multimedia API functions
mmioOpen
mmioClose
mmioDescend
mmioAscend
mmioRead
allow to open a WAV file and read its chunks (sections).

FMT chunk contains format data: channels, samples per second, bits per sample.

With this data you are able to calculate an average bytes per second value:

[Bytes per Second] = [channels] * [samples per second] * [bits per sample]/8

DATA chunk contains data size in bytes.

So finally:

[Play time] = [data size] / [Bytes per Second]

There is a sample FoxPro code (members area) here showing how to read and play a WAV file:
WAV file player
http://www.news2news.com/vfp/?example=417

For just playing WAV files there is much more simple in use API function sndPlaySound
How to play a waveform sound
http://www.news2news.com/vfp/?example=251&function=398