According to the latest Calculations by Prof Sleepy Von de-Blah

The complete Prep should take 4 months 35 days 86 hrs 94 mins 10 secs.
so there, figure it out
Nahin yaar, depends on you na, just focus on the basics, practice yr tables, squares and cubes, Assuming you are cosy and comfy wid the angrazi, and are to be capable of being able to try to be solving questions of the verbaal kinds, without two muches of takleef,
Methinks 3 months can be enough, dont let the amt of work needed swamp u,
It can be assured there are enough questions in any CAT paper that can be solved just by simple appl. of basics to clear any Cut-off.
You just need some practice to be able to find them