How many password changes can a DPA perform per hour?
Please note that DPAs are not intended to increase the number of password management tasks that can be performed, they simply provide network segmentation capabilities (i.e. a footprint inside a secured network segment, such as a PCI enclave.)
All password management tasks are initiated from the console, with the actual connection to the target host performed by the DPA. As such, the number of password changes a DPA can perform per hour really depends on the capacity of the PPM appliance it is connected to.