Or, embed this snippet using GenerateWP WordPress Plugin.

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Auto Refresher

Automatically refresh page

<?php
function wpmudev_auto_refresh_page_after_inactivity(){

	echo '<script>

	     var time = new Date().getTime();
	     jQuery(document.body).bind("mousemove keypress", function(e) {
	         time = new Date().getTime();
	     });

	     function refresh() {
	         if(new Date().getTime() - time >= 6000000)
	             window.location.reload(true);
	         else
	             setTimeout(refresh, 1000000);
	     }

	     setTimeout(refresh, 1000000);

	</script>';

}
add_action('wp_footer','wpmudev_auto_refresh_page_after_inactivity', 99);
?>