I've been asked this question a lot lately. I have more than the number of practice days needed to test for 3rd kyu at this point. Actually, I've had enough days in that I could have tested a few months ago.
I have no doubt that I could pass a 3rd kyu test. I'm sure I could demonstrate the required techniques in a proficient enough manner. However, there are aspects of my practice that I'd like to see come along a little further before I test for 3rd kyu.
I feel it's necessary. In my mind, tests should be taken when the time is right. Not just when the bell rings indicating you've put in x amount of days. My rate of progression for aikido will not be changed on whether or not I take the test. Don't get me wrong, I don't avoid testing when needed, I just feel that having more of a 'buffer' for passing is important.
The downside of this of course is that people blow past me in rank and in fact, someone that started aikido much later than me is planning on testing for 3rd kyu at the end of this month. I'm fine with this... in fact, I'm likely going to be uke for her for the test.
Think of it this way..... when the time comes for me to take a test.... any test... I'd rather there be no question in the examiners minds as to whether I should pass or not.
Go for the knock out... Don't leave it in the judge's hands.