Can Google's AI recognize what you're drawing within 20 seconds?

The site. It's like playing a lightning fast solo game of Draw Something:

Can a neural network learn to recognize doodling?
Help teach it by adding your drawings to the world’s largest doodling data set, shared publicly to help with machine learning research.

My contributions--most were recognized instantly. "Screwdriver" and "sheep" took it a few seconds. I stumped it with "calendar."