First let's discuss the following, which you said.
i can't imagine writing this exams twice. it won't do any good for my confidence going into Business school.
To succeed on this test and in school you would do well to consider adjusting something about that. You can't let things like a tough question, or getting behind on time, or having to take a test twice, shake your confidence. There is a guy who posted on this forum that he has taken the test six times, and he will probably take it another time. He just keeps at it and has been driving up his score. We can all learn from him.
Regarding timing on quant, one thing I have been doing is being more conscious of time it takes to do problems, even when I am doing one slowly as I learn something. Also I notice that there are simple things I can do to save time. For instance I had a habit of rereading questions, to no end really. Now I seek to only reread when I really need to in order to answer the question. If I need to reread, fine, but if I don't then I have to be careful to just move on and work on the problem. Also, even the descriptions in word problems can suck up time. Does it matter that the students go to Happy Valley High School when I am seeking to figure out how many take both English and math? Not really. So I am making sure I don't get distracted by things like that.
Guessing on questions that one pretty obviously will not complete in anywhere close to two minutes is another way to save time and to have more time to do other questions that one can complete quickly.
Next step, take a practice CAT and see how you are doing. If you are at or near your goal, then your two week time frame sounds good. If you are far from it, or well below that 600 cutoff, even pushing back the test date a week or two would significantly augment your time to increase your skills and your score.