How is a ‘visit’ defined in Piwik PRO?
The first time a visitor comes to your website, or once he visits a page (or downloads a file) more than 30 minutes after his last page view, this will be recorded as a new visit. A Unique Visitor can make multiple Visits per day.
During a first visit, the visitor is a New Visitor. From the second visit, a Unique Visitor is a Returning Visitor.
We can help you change the 30 minutes value (session timeout) – just let us know on email@example.com