bStateSave cookie: when does this reset?

Hi,

We have a problem regarding bStateSave cookie. We have used bStateSave=true. The feature is working fine, but it works a little too much.
It remembers the state even after the user logs out of the application. So the next time when user again visits the page, the settings are still there.

Q1. When does the cookie gets deleted/reset?
Q2. Is there a way to manually delete/reset the cookie?

Thanks a lot in advance.
- Aalap