Yeah I took that Exam... having to think so hard for 8 hours left me with a headache that lasted the rest of the day, and messed up my sleep schedule somehow too. Glad its over but I won't get results for another 8-10 weeks.
8 hours is a pretty crazy length even for a major exam like that. They do take a while to return grades and such with those things, too... Good luck with the eventual results.