That seems like a lot. However, I don't think that this will cause harm as long as you give yourself ample time to properly review the questions. In other words, don't attempt to cram all of this in the last week of your prep. And don't worry about completing all of the questions. Push yourself, but don't go overboard with it. If you can "only" finish half, then you're still in great shape!
I used the LSAT SuperPrep, which contains 150 LR and 100 RC questions, and that was sufficient for me (though I also practiced some LR problems in the CR Verbal Forum).