How big is Qt's event queue? Is its size customizable? What will happen to the signaler when it gets "full"?

Example:

I have 2 threads: thread A and thread B.

A has a signal "Sig()" which is fired at every 1 second.

B has a slot called "Slot()" which takes 2 seconds to process.

I tie the 2 threads together by connecting A "Sig()" to B "Slot()"

Obviously, things will start to queue up. I've verified this that events do get queued up even if Slot() is not keeping up.

The question is:

What's the behavior of the Qt event loop as time approaches infinity. =p