If most visitors are only viewing one page, it may be an indication that the page where they entered didn't effectively guide them to the content they needed. This section shows how many visitors viewed your web site and how long they stayed. The information is split up into time slices based on the duration of the log file. The Visitor Session Statistics section shows visitor session activity for the reporting period. Visitors are typically tracked using the cookie that's been defined or by their IP addresses.
Visitors shows the number of visitor sessions for each interval.
Unique Visitors shows the number of unique visitor sessions. A total count of visitors and visitor sessions is available in the General Statistics table. You must use a persistent cookie on your web server and have defined it in the program to get this information. Average Visit Length shows the average length of the visitor session for each interval. Visitor-Minutes provides the total number of minutes that visitors viewed your site based on the sum of each visitor session for the interval.