Visit, Session and Duration Metrics
VISIT - A series of one or more PAGE IMPRESSIONS, served to a validBROWSER, which ends when there is a gap of 30 minutes or more between successive PAGE IMPRESSIONS for that BROWSER.
SESSION - A series of PAGE IMPRESSIONS served in an unbroken sequence from within the site to the same BROWSER.
VISIT DURATION - The total time in seconds for all VISITS of two or more PAGE IMPRESSIONS, divided by the total number of VISITS of two or more PAGE IMPRESSIONS.
UNIQUE BROWSER DURATION - The total time in seconds for all VISITS of two or more PAGE IMPRESSIONS, divided by the total number of UNIQUE BROWSERS making such VISITS.
CHAT DURATION - The total elapsed time in seconds between the first and last time stamp recorded for each valid BROWSER'S CHAT IMPRESSIONS.
STREAM DURATION - The elapsed time in seconds between the first and last recorded file transmission for each stream sent to a valid BROWSER.
INTERACTIVE DURATION - The total elapsed time in seconds between the serving of an interactive file and any subsequent files to a valid BROWSER. NB: if no record of a subsequent file can be determined then the duration is deemed to be zero.