assuming you see an image every 400ms which is given blinking and activation of neural pathways a good approximation.
Billion images per that rate is equivalent to 12 years of never stopping to watch<p>there have been systems that learned to generalize after seeing couple of examples not thousands (digit recognition)<p>child can see just one animal and label it as a monkey, an algorithm could probably do the same with more algorithmic machinery, but we are still not there