For those who get visa on arrival, they are eligible for another 1 month extension. There are no further extensions after this. This is very easy, applied for my wife and daughter today, went to the Passport and Immigration at Meisameer, took a token for visa extension, went to the counter, paid 100QAR each and job done. As easy as it could be and straight forward. Literally was out of the office in less than 10 minutes.

If you require more than 1 extension, then you would have to exit and enter, no other way.