Hi
kfactor901@gmail.com,
Thanks for the question!
Prephrasing is indeed absolutely essential to optimal performance on the test, and many students neglect to do it for the same exact reason you do: time! Paradoxically, it is the failure to prephrase consistently that often leads to a time crunch. How often have you approached the answer choices without a clear understanding of what it is you're looking for, only to get "stuck" between two answer choices that you read and re-read 10 times? That's precisely why prephrasing ultimately saves you time!
Just like inferences in Logic Games, it requires a small investment of time in the beginning, but you're bound to recoup it down the road. The simple, brilliant idea behind it, is this: by formulating a suitably general prephrase, you are much less likely to consider any incorrect answer choice attractive—even those that are meant to be attractive!
Check out these Blog posts on this subject:
http://blog.powerscore.com/lsat/lsat-an ... -prephrase
http://blog.powerscore.com/lsat/bid/153 ... ing-part-i
http://blog.powerscore.com/lsat/bid/153 ... ng-part-ii
http://blog.powerscore.com/lsat/bid/153 ... -Questions
Also remember: prephrasing is just as valuable on the LR section as it is on the RC section!
Good luck!!