On the Productivity Portlet the QPH calculation at times seems exceptionally high can you explain why that is?

Viewpoint

On the Productivity Portlet the QPH calculation at times seems exceptionally high can you explain why that is?

We just upgraded to Viewpoint 15.10 and I started using the Productivity portlet.   WHen I choose to monitor a particular user/session there are times that it gives me QPH (queries per hour) that seem to be unrealistic, while at other times it seems quite normal.   

What is it really counting?  If we initiate a query that is doing an all amp query does the QPH get multiplied by the number of amps on the system?   

Thanks in advance.

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