W
Whitecrest
Yup. You'll know exactly when the user hit the login page and when the
user hit the logout page. You still don't know anything for the
intervening time -- your user could've been off at some other website, or
had his browser closed, or not even near the computer.
By the same logic, knowing the circulation of a Newspaper is useless,
because someone might not open your section of the paper, or your insert
may fall out. Or what ever.
Yes, the statistics you can get are not exact, but they are more than
usable for studying trends, and understanding that can make you a lot of
money