On Mon, 22 Jun 2009 15:50:51 -0300, Alejandro Martinez <amartinez@xxxxxxxxxxxxxx> wrote: > Amos, thanks for your reply. > > The last question, how do youy estimate that time ?? Now there is a deep philosophical question. You would probably best look up research info to get an accurate answer. Basically: requests are broken into 3 sets: unprocessed, selected, and finished. 1) take request X as a starting point. 2) Then select all requests that have X as a referrer made within 30 seconds (user max attention span for page load time). 3) Repeat (2) until no more requests are added using referer info. 4) Then pick a timespan T and select all requests made from same IP as X within time T of the existing range. 5) shuffle the first request we started with in (1) into the finished pile. 5) for each request now selected (4) go back and repeat (1)->(4) for X being that selected request. 6) repeat steps (2)->(5) until there are no new requests to handle. 7) track the earliest and latest timestamp from all requests processed in the above. Your 'visitor time' for _one_ session is the difference between those two. This is just me, but a measure for T of 5 minutes seems about right to catch my clients usage patterns. Accurate values requires research. I highly recommend finding an existing tool that does all this for you. Writing it from scratch is complicated at best and I'm sure I missed some complex issue out of my quick description above. Amos > > Thanks, > Alejandro > > Amos Jeffries escribió: >> Alejandro Martinez wrote: >>> Is there any chance to get the elapsed time a user has spent on a site ? >>> >>> If a user acces a site (ex: www.site.com) at 9:00 am for about 15 >>> minutes, and then He access again at 12:00 for about another 15 >>> minutes, how do I know the total timeelapsed on that site ? >>> >>> This question is because I've read that if you take the last log >>> access - the first log access for that site you can estimate it, but >>> if I do that, I have 3 hours and not 30 minutes. >>> >>> >>> I've seen that SARG show a total time on a site, but is that time true? >> >> No its an estimate based on first and last page visits. >> >> >> Download time and duration for requests can be found in the log. That >> will be what SARG is basing its calculations on. >> >> Most users 'access' a site in the order of a few seconds at a time. >> The rest of the time is spent looking at a web browser display >> completely offline. >> >> Amos
