Can someone explain an accutane maintenance dose to me please?

I find a lot of conflicting information regarding maintenance doses of accutane on the internet. Currently I am on 10 mg/day and plan to run this for two months. I am on this purely for oily skin. Would a two month course at this amount followed by 20 mg a week indefinitely work in keeping my skin oil free permanently? I am running this course under the supervision of a dermatologist. Thank you very much for taking the time to read my question.