I'll hold my tongue regarding Kaplan
's LSAT books, but whatever you do, please completely ignore the time limits on the LSAT. The LSAT very explicitly tests reading speed, since law school requires an absolutely ridiculous amount of reading. You have to be a freak of nature to finish 25 LSAT questions in 35 minutes. If you're taking the GMAT, don't bother trying to move that quickly. Your accuracy will suffer enormously, and so will your confidence.
On average, LSAT questions are longer and denser than their GMAT counterparts, so they should take you a little bit more than two minutes each. As a very general guideline, finishing LSAT sections in less than an hour should put you on track to complete the GMAT verbal section on time, assuming that your sentence correction speed isn't unusually slow or fast.
But don't get too hyped up about the timing if you're just getting started with the LSAT (or with CR and RC in general). Focus on precision and accuracy at first, and then you can begin to pick up the pace once you've developed a pretty good handle on the questions.
Helping students kick the GMAT in the nuts since 2002... www.gmatninja.com.