Mine lasted approximately 8 hours, with a half-hour lunch wedged in their (we had to brown bag our lunch). So really, about 7 1/2 hours. Started with a mile run for each degree of black belt you were testing for. Then lots of conditioning. 500 crunches, 100 pushups. 250 kicks, 500 punches. Free flow for several minutes on heavy bag, speed bag, recoil bag. Then the test started. My instructor is sooooooooo completely thorough in our testing. We do every form/kata, every set/exercise, and basically any thing and everything we ever learned. We had to explain each technique in forms. Then we had a self-defense section of the test, kind of like 2 step sparring. Alot of "new" things were thrown at us that we hadn't trained in, just to see how we would react. Then a sparring session which lasted about 2 hours. We sparred using only hands, then only feet, then both, then against 2 opponents, then 3 opponents. Finally, we had to present our essay on "what kung fu means to me". Then I dragged my tired @ss home. Belt/sash presentations were made the following day in front of the entire school.