there is not too much content in DM that cannot be done fairly quickly, the tests, the knowledge reviews, the swim tests, you could knock that out in a day assuming you passed all the tests. the rest is done in classes with students, that can take 1-6 months depending on how active the shop is. I would not skip that part with or without the certification, it is one thing to say you are a DM it is another to have the interpersonal skills with real new divers to make them feel comfortable and successful at their new hobby. however if you are a good listener and have confidence in your abilities with students and your instructor agrees then I see no reason not to be certified in a week. Assuming you plan to learn for the rest of your life and not stop once you get the card in the mail.