<?php
$video_id = 'HwELajFteTo';
$yt = simplexml_load_file('http://gdata.youtube.com/feeds/api/videos/' . $video_id);
$media = $yt->children('http://search.yahoo.com/mrss/');
$ytdata = $media->children('http://gdata.youtube.com/schemas/2007');
$attrs = $ytdata->duration->attributes(); ;
$duration = sprintf('%0.2f', $attrs['seconds']/60);
echo $duration;
?>