And, in case you're curious about many times she can open and close the cash register drawer in a minute and a half, the answer is 8.
My favorite part (that I didn't manage to capture) was when she first started playing with the drawer and had just figured out how to open it. Once it popped out, she grasped the edge of it and tried to lift it up.
You know how most cash register drawers have a tray that holds bills and coins that you can lift to store checks and large bills underneath?
She knows, too.
Just give this genius your money already.