Congrats, that's quite impressive. What an honor to be graded under those excelent karate-ka. Usually I think, it is much more difficult to grade at the brownbelt level. I remember my 6th, 5th, and 4th kyu were surprisingly easy, but my 3rd kyu test lasted around 6 hours and was very extensive. It cooled down around 2nd kyu, and 1st kyu still wasn't as hard as my 3rd kyu test. I'm sure my shodan test will be much more difficult.