The longtimenosee setting is currently a site-wide setting. It would be more useful if it were made a course-level setting.
For example, in the moodle.org site, the main Using Moodle course needs a short setting (30 days) while Moodle for Language Teaching has more infrequent traffic. We have a monthly news go out and don't want to keep losing our subscribers. So we hope to set the longtimenosee to a longer period--say 90 or 120 days.