LSAT

I am leaving in 20 minutes to walk across campus 30 minutes to the Psychology building where I will take my first (and hopefully only) real LSAT.  Apparently (according to the rules/regulations sheet) even though the total test should not really take more than 4 hours tops (and that's adding about 45 minutes of just crap that is unnecessary)  the LSAT can last up to 7 hours.  How the hell does that happen?  I don't want to know.