public static function prettySeconds( $seconds = 0.0 )
    {
        $_remain = $seconds;
        $_hours = floor( $_remain / Enums\DateTime::SecondsPerHour );
        $_remain -= $_hours * Enums\DateTime::SecondsPerHour;

        $_minutes = floor( $_remain / Enums\DateTime::SecondsPerMinute );
        $_remain -= $_minutes * Enums\DateTime::SecondsPerMinute;

        return $_hours . 'h ' . $_minutes . 'm ' . number_format( $_remain, 2 ) . 's';
    }