Roon does not appear to include the time spent streaming Live Radio in the Recent Listening display of hours/minutes per day. This is a minor issue, of course, but I was a bit surprised to find this.
Perhaps part of the reason for this exclusion is due to a lack of Genre tags associated with Live Radio stations. While it is possible to search radio stations by “categories,” these appear to be distinct from the genres used for conventional playback from the Roon library. Embedded in this observation is probably a feature request to allow users to tag radio stations with Genres.