Unfortunately there is no such report, you can get some real time information via CLI on who is connected, but not a report over a certain period of time.
run pe sql ttlogin select * from clientsessions
Depending on your IM&P, you might have a presence usage report under IM&P reporting which would also provide real time info
For my own education as well. I would usually look at XMPP connections using RTMT to see how many jabber clients were connected. Is that not a valid method? Have I been doing it wrong this whole time? lol
There are a few ways, mostly depends on what you're looking for, or if you have access to RTMT or not.