Providing you didn't just ruin out of revolutions you may have just reached a harmonic that visually stoops the rotation. Sometimes you do run out of numbers AE can calculate.
Let's examine your problem. 36 seconds at 29.97fps is 1079 frames. 200 revolutions is 72000º. That means your image rotates 66.7284523º per frame. Mathematically, that would be exactly the same as 5.395º per frame. Depending on your frame rate you could probably cut the number of rotations down to less than 50 and achieve the same look. If you wanted a radical motion blur you could just precompose the layer and CC Force Motion Blur and jack up the shutter angle. If it were my project I'd just add a simple expression to the rotation property. Something like time*666 would do it.
Thank you very much for your answer, Rick. The time expression did work well. I tried to bring up the variable more too to make it faster and it stopped again. At least this time it stopped around 25 seconds. Since this is just a test to see how it's suppose to look, I cut it at 20 seconds. Not trying to spend so much time on a test when I still have flash characters to animate..
Thanks again, I'll be adding what you've told me into my notes.