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In June, the visit length (Monthly Visit Length) dropped dramatically for most of our sites. There was a huge increase of Yahoo Slurp bots that could account for that decrease in June. Before the bots, the average visit length on one of our sites was 2 minutes and it dropped down to less than 30 seconds.

By September, the number of Yahoo Slurp bots (and other bots) had dropped down to slightly above the numbers of April and May. The total number of visits has also dropped back down to normal numbers. However, the visit length has still stayed down.

Has anyone else experienced this? Could the bots just not be registering as bots anymore? Do you know of any other reason the visit length hasn't come back up?

Hello,

I am having a similar issue.

When viewing the report Visitors -> Daily Visit Length, it can be noticed that the visit length changes from an average of about 100 seconds to an average of 10 or less after April 29. Also on this page it shows the # of visitors averaging around 1,500 a day down from about 35,000 a day.
However, when looking at the Monthly Visitor view, it shows the number of visits for May up to 1.4M, whereas in April it says 1.0M 

Can someone make sense of this please? We have re-processed and re-imported a number of times. When importing the same log files into Urchin, the stats are fine. What puzzles me is it was going fine forever until now.

This originally occured in v3, we installed v4 and the same thing happened. The strangest part is it was working fine for a month or so in v4 until suddenly it happened again.

Any insight is appreciated.

Thank you,

-Brock