sorry I haven't had time to review that since you sent me that PM, I was going to look at it this weekend when I had some free time. sense I'm posting can you give me a model that demonstrates the problem well?
I am assuming the animation it's self does not actually take 100 second.
I have to warn you though it's been about 3 years since I last looked at that code.
that section of code quoted is saying (total change in angle)/(rate of change of angle) = time, I don't think that logic is too bizarre, and I did a better job explaining my math in that system than I had in the past, though there were some bits that were a little odd, and the reversing an already active animation code was by far the oddest and most difficult to test.
and there is an animation queue involved, it's how an even in one frame can trigger an animation a thousand frames later.