Determine audio file play time from size

Hello!
I have a mp3 file and i want to determine it's play time from it's length. Is this thing possible? Could anyone point me in the right direction?
Thanks in advance!
Cheers!
Radu

Thanks you both for your replies!
I posted yesterday late in the evening and my brain didn't work quite well :)). After i've read your posts today, i realized that i will be using mplayer in slave mode to play the audio file, and a quick google search showed me that mplayer offers a way to retreive the play time of any audio/video file (in seconds). Tested it today and it works! So i guess my question has been answered.
Thanks again
Cheers!
Radu

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Determine audio file play time from size

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