The number of visits made by the website’s visitors.
A visit is defined as one or more actions (typically page views) which are performed no longer than 30 minutes apart.
If the visitor is inactive for longer than 30 minutes, his or her visit is considered terminated. Once the visitor resumes activity, a new visit is registered.
It is necessary to apply time-outs, since one cannot know when the visitor leaves the website. The reason is that the registration of visits is based on timestamps that are set only at the start of each action. The missing time stamps at the end of an action mean that the last action’s termination cannot be identified.