time out sudo privileges immediately?

[Hekabe]

How do I make sudo require a password every use in terminal? As in, once you do one sudo operation, sudo stays authorized for five minutes unless you specifically revoke it (sudo -k). how do I make it time out immediately?
Note: I'm running Ubuntu Studio 12.4, and I use Guake for all my terminal stuff. Don't know if that would affect it.

[Cheesemill]

It's in the documentation:

https://help.ubuntu.com/community/RootSudoTimeout

[Hekabe]

Thanks a lot. Now my paranoia is satisfied.

[Lars Noodén]

You can set it for the whole set of users by making it the default.

Defaults        timestamp_timeout=0

Or you can set it for some users and not others. The full explanations of options is in the manual page for sudoers.