Quit work early (incomplete hour shift). Make those moments. There are no special customer service. And affect the operation of the system (close to the daily worker).
Early work (Not a full hour shifts) make during this period. No employees serve customers and affect the functioning of the system. (Closed cycle daily operations).
Get off work early (not hours by shift work) made in that period. No staff to customer service. and affect the function of the accounting system. (closed around the practice routine).