Glucose Molecule is 30 ATP

The net ATP yield for the complete oxidation of a single glucose molecule is 30 ATP. Phosphorolysis saves energy and retains glucose inside the cell. Starting with glucose , calculate the net ATP yield for the complete oxidation an average glucose molecule if it were first converted into glycogen and then instead a phosphorolysis, ALL glucose was released from glycogen by hydrolysis. How does this number compare to the 30 ATP?