How long should a web site "remember" cookie information in its logs after a user's visit? And when should a cookie expire on your computer? Cookie privacy is both a server and a client issue.
The Google blog has posted about Cookies expiration, here is what they say --"On the server side, we recently announced that we will anonymize our search server logs — including IP addresses and cookie ID numbers — after 18 months."
In the coming months, Google will start issuing our users cookies that will be set to auto-expire after 2 years, while auto-renewing the cookies of active users during this time period. In other words, users who do not return to Google will have their cookies auto-expire after 2 years. Regular Google users will have their cookies auto-renew, so that their preferences are not lost. And, as always, all users will still be able to control their cookies at any time via their browsers.
Google, Internet, Browser, Cookie, Cookie Expirey, Google News