AFTER THE 6 MONTHS EXTENSION , IMMIGRATION WILL ALOW YOU TO EXTEND FOR ANOTHER 2 WEEKS OR A MAXIMUM OF 1 MONTH ADDITIONAL BUT THAT IS CASE TO CASE BASIS AND YOU SHOULD HAVE A PLANE TICKET AS ADDITIONAL REQUIREMENTS. YOU CANNOT EXTEND FOR ANOTHER 6 MONTHS , ONLY 2 WEEKS TO 1 MONTH. IN CASE YOU WANT TO APPLY AGAIN A VISIT VISA, THEY HAVE TO EXIT QATAR THEN YOU CAN APPLY A VISIT VISA AGAIN AFTER 3 MONTHS...