How long can twitter remember your log in for?

[b2311e]

For as long as the cookie is there.
Theoretically, this is infinite - Provided you don't clear your cookies or the cookie expires.

Sometimes, cookies will expire for security reasons, and ask a user to re-enter their password, but having been such a long time, I'd be tempted to say this would have happened by now.

The only other way the account could be logged out is if there was a security breach, and passwords are lost (unlikely) - This would mean all users have to change their passwords, so all sessions would expire.