My wife works as a junior accounting clerk in the finance department of a small-medium (500-ish person) company. She has to reconcile credit cards each month. Yes, it takes days when there are poorly documented charges (federal contractor so all of these charges have to be documented to bill to a contract).

Down to the penny. Two months ago my wife spent half a day tracking down a 2 cent discrepancy when somebody's handwritten 7 looked like a 9.