I got a hit on a ten dollar bill this afternoon that I enter over two years ago. I worked at a hotel and I would enter the bills in the cash drawer there. I gotten some hits off the bills I have entered doing that time.
It is great to get a hit from a hotel and airports. You do not know where the next hit will happen. These are places where people are most likely travels miles away to their next destination. It is always good to get a hit after two years or for on a bill.