public static function convertInto(float $time, string $unit, string $destUnit)
    {
        if (!$time) {
            return 0;
        }

        self::validateUnit($unit);
        self::validateUnit($destUnit);

        $destMultiplier = self::$map[$destUnit];
        $sourceMultiplier = self::$map[$unit];

        $time = $destMultiplier / ($time * $sourceMultiplier);

        return $time;
    }