Cookie expiration time is 1,036,800 seconds, which 17,280 minutes, 288 hours or 12 days.

Cookies also expire immediately on the old PC, if you log in from a new PC.

As for this being "the only forum that I have to re-log into every couple of weeks", what a load of rubbish .... quite common to have a cookie refresh requirement.

This was a recent thread topic which I thought '500nigel' whined about then too ...