Answer: an infinite amount of money can be created.
Explanation:
From the question, if there is no withdrawal demands on a bank from it's customers this would imply that there would be no need for reserves to be kept by the bank, as the reserves are back up for the bank to meet up with payment to it's customers in case of future failure on the bank's path.
If withdrawal demands are not existent, the banks can produce and store up an infinite amount of cash.
