In contrast, the US federal government observes 10 holidays, and most businesses probably only close for 5 - 7 of those.
http://www.opm.gov/operating_status_schedules/fedhol/2011.as...
When you're an American in Europe for an extended period of time, you feel like everything is always closed (short business hours plus so many holidays). I hear that business hours have been expanding, though.