Not as a report, but you can do that, as long as you do not need to look farther back than you data retention interval.
Go to Clients/all, select the default view, click on the "Association Time" column to sort by association time.
If you might have clients that stay associated for days, hit the + on near the views dropdown menu to generate a custom view, include the "Association time" field and the "Duration" field and other fields you want, and export as csv if you like, then remove the longstanding clients with a script.