I think having two solid months of studying is ideal, so if you study consistently starting now up until the end, you'll be golden as long as you don't fall off track and use your time efficiently. Will that be enough time for you? Reflect on your study habits and see if you can do it within that time frame. If you feel overwhelmed, maybe you can push it back to spring break instead. Only you know yourself 🙂 Remember that it's not about quantity, but rather quality. You can put in all the hours you want to studying, but it won't matter unless you study wisely. Do make sure you take some breaks, especially with the holidays approaching for some family time!
One extra week between the 6th and 14th can either make no difference or all the difference. By that I mean if you half-ass your preparation and all of a sudden it' January, then that one extra week can definitely help you catch up. But if you study a little bit each day and increase the hours as the exam day approaches, I think you can prepare well for the 6th.