Having been through this myself quite recently, it is very difficult to wait. Meanwhile, you get to enjoy a nice roller coaster ride of emotions within. I found it very difficult to sleep between the time he took the test and the in-person meeting (I think we had to wait about 5 days for the results to come back).

If it makes you feel any better, DS6 took quite a long time on his assessment. We thought it might have been because he was having difficulty, but it ended up being because he kept answering the questions correctly so they would keep going on the subtests. So a long test can be a very good thing.