When a site Visit (or “session”) begins with a request for content, this event “starts the clock” on the Time Spent measure. Each event within the session extends the Visit, and adds to the Time Spent by the user. Accounting for these one-event, “single page visits,” is important to the overall calculation of an average Time Spent measure for a site. Inactivity rules that result in the termination of a visit (as disclosed by the measurement organization) should include the time thresholds triggering the inactivity rules, as well as the amount of Time Spent to be credited. (See Visit).