Squid logs reports and database size

Hello,

I'm trying your software since 3 days for squid logs analysis and I find it really good but I've some trouble with several things.

1st) On the reports, the time that the users have been watching websites is totally wrong. I mean, for one hour of logs, they say that the user has been watching the website for 36 hours for example and this value is so big for all users... Really wierd and in another report tool I've got correct values so.... Where can I correct this?

2nd) My database has grow up in 3 days of 4Go approx. How can I delete old reports to make more space available?

Thanks in advance for your reply.

Kindly Regards.
Poy.