idleTimeoutInSeconds -1

I have the 'idleTimeoutInSeconds' set to -1, however this doesn't seem to have an effect.

TimeMe.initialize({
    currentPageName: "live.php", // current page
    idleTimeoutInSeconds: -1 // seconds
});

setInterval(function(){
    var timeSpentOnPage = TimeMe.getTimeOnCurrentPageInSeconds();
    console.log(timeSpentOnPage);
    $.post( "record.php", { uuid: "<?php echo $uuid; ?>", time: timeSpentOnPage, page: 'live.php' } );
}, 1000);

Otherwise, script runs fine.