If it is how often you're asked for password what annoys you most, you can change the sudo timeout (it's 15 minutes by default):
Originally Posted by USSEnterprise
That will set the timeout to 30 minutes.
echo Defaults timestamp_timeout=30 | sudo tee /etc/sudoers.d/timeout
sudo chmod 0440 /etc/sudoers.d/timeout
Disclaimer. This works on Debian wheezy because /etc/sudoers contains the line #includedir /etc/sudoers.d. Hopefully, it will work with Lubuntu 12.10, too. Can someone with access to Ubuntu 12.10 confirm that that line is present in /etc/sudoers?