Settings::getInterval

public function getInterval()
{
	$value = $this->getIntervalValue();
	if($value <= 0) return 0;

	$type = $this->getIntervalType();
	switch($type)
	{
		case 'H': // hours
			$koeff = 60;
			break;
		case 'D': // days
			$koeff = 60*24;
			break;
		case 'M': // minutes
		default:
			$koeff = 1;
	}

	return $value * $koeff;
}