You should have more than enough time for these two tasks in 24 to 48 hours. Take a break from writing.
However, be prepared to put in a lot of time and effort. If you are really in the flow of writing your dissertation then keep on going with it. Get changed into something comfortable, no first year planning your outfit for the library, whatever you think you will be able to work best in.
Try to get into the habit of getting up and writing your 1, words straight away. When you consider the importance of a dissertation and the fact that it can be the difference between obtaining your degree and not, the question is not so much can you write a dissertation in 2 weeks, but should you?
This is why professional writers always write their intro and conclusion last.