estimated reading time for blogposts

hey there,

i want to add this function in enfold_childs function.php in order to estimate the needed time to read an article:

/**
 * Estimate time required to read the article
 *
 * @return string
 */
function bm_estimated_reading_time() {

	$post = get_post();

	$words = str_word_count( strip_tags( $post->post_content ) );
	$minutes = floor( $words / 120 );
	$seconds = floor( $words % 120 / ( 120 / 60 ) );

	if ( 1 < = $minutes ) {
		$estimated_time = $minutes . ' Minuten' . ($minutes == 1 ? '' : 's') . ', ' . $seconds . ' Sekunden' . ($seconds == 1 ? '' : 's');
	} else {
		$estimated_time = $seconds . ' Sekunden' . ($seconds == 1 ? '' : 's');
	}

	return $estimated_time;

}

But unfirtunately it breaks my site. Do you see the mistake? I really do not want to use a plugin, because most of them use the time for every page.

Please help me – and maybe you can put it as a feature to the next release :-)
tobi