GMAT Verbal Section | Re: LSAT RC Timing?

RC Section: Last week I started my RC preparation after covering the concepts of RC passages through Manhattan & Kaplan Books then practiced LSAT Exam sets, so far 3 exams (total 12 passages). During the LSAT test, my accuracy has improved - (5 to 6 Correct out of 7/8 Qs). However, I am taking too much time, for every passage which contains 7 or 8 questions, I am taking 20 minutes.

I haven't taken OG RC tests yet but my concern is timing - can someone please suggest if this is normal or