Is there a way to track when an agent is logged into RC and when they are logged out? Alternatively, can we track when they are available in a queue?

We want to determine the amount of time a user is spending in each queue each day. (Not just the live reports).

I see there is a Get Call Queue Members in the API, but I believe this will only provide the list at that moment, is this correct? In other words, I'd be force to query it every minute to track changes.