Is there anyway to list down all the operators who logged into the system in a specific period of time. For e.g. I need to list down the requestor counts/names (or session) which was created daily between 11-3 PM.

Out of the box, PRPC maintains a table pr_hourly_usage, but that will give you the data at a specific time only. for e.g. list of active requestors or session from 11 to 3 PM daily. but it won't give you overall idea about the total requestors or session created in a given time range.