It depends upon your Nationality. If you are an Indian, a Pakistani or from Philippines, you can extend for 30 days more showing a valid reason only for other Nationalities coming on arrival visa, it's quite easy to extend.
Thanks for your suggestions.
This is the second time you have posted this query within a week at QL. Apparently, either people don't know the answer or they are not bothered to help out someone.
There are three ways to get the right answer. First, ask the Mandoob of your company. Second, ask travel agents or even those shops that do government work commonly called Hukoomi. Third and the best way is to take a trip to any passport & immigration office and find out from the authorities. The office at the airport works 24/7.