How many times can a creditor call you in one day?

The FDCPA allows creditors to contact debtors as many times as needed as long as it cannot be defined as harassment. For example, a creditor/collector could probably call a dozen times within the 8:00 am to 9:00 pm time allotment without being in violation. However, they cannot call continually, for example every hour, every half hour, etc. Persons subjected to creditor calls should bear in mind that they have no legal obligation to speak with the caller.