As long as you didn't change these lines in the index.php:
PHP Code:
$updatetime = 10;
$statsupdate = '';
$getupdatetime = vbdate("$vboptions[timeformat] - F jS, Y", $statscache['lastupdate']);
$statsupdate = "<font color=green>Last updated at $getupdatetime</font> ";
if ($statscache['lastupdate'] == 0 OR ($statscache['lastupdate'] + ($updatetime * 60)) < TIMENOW)
it should be updating the time every 10 minutes.