> You forgot to lock your computer when you went to lunch, and the attacker sat down at your desk and gained access to your machine. > In this case, session ex

> You forgot to lock your computer when you went to lunch, and the attacker sat down at your desk and gained access to your machine. > In this case, session expiration may prevent them from gaining access to your session, if they weren’t fast enough. However, they now have access to your email, ... Only because GMail sessions never expire now.