A visit (also known as a session) is a combination of pageviews (requests) within a 30-minute time frame. If a user requests the FanExam tag 10 times within a maximum 30-minute delta, this will be considered one visit. If a user requests our tag more than 30 minutes after a previous request, this is considered a second visit. Our visit system is based on the system Google Analytics uses, and they have a great article that explains in-depth the difference here: https://support.google.com/analytics/answer/2731565?hl=en