Tweener Documentation
AS2 and AS3.
... count:value, ...
value:Number — How many times you want the onUpdate function of an addCaller tweening to be called.
// Calls myFunction 10 times in 1 second
Tweener.addCaller(myMovieClip, {onUpdate:myFunction, count:10, time:1});
// Calls myFunction 2 times in 20 seconds, going faster and faster
Tweener.addCaller(myMovieClip, {onUpdate:myFunction, count:2, time:20, transition:"easeInExpo"});