Outlook Calendar Sound Length

[EMitchell]

Some time ago, maybe a month, my calendar appointment sound became very short. Up to that point, I could have at least a minute of whatever .mp3 I wanted, now it only lasts about 10 seconds, no matter how long the .mp3 file is. Something has obviously changed, but I can't find any setting on the phone to say how long to play the calendar alarm tone. Any suggestions?