Number of loops is the number of counts the wav file will be played. Span is the time duration (in minutes) when the application rings again.
For eg. If your loop is 5 and span is 30, then at the time of your start the application would play the wav file 5 number of times. It will replay the sound 5 number of times again after a span of 30 minutes.
The original requirement was to make it ring periodically.
If someone cant hear the wav file even if it rings 5 times then I dont think he will hear it if it rings 10 times too
I hope I answered all your queries