To avoid this needing to type password for sudo, you can edit /etc/sudoers and add this command at the end of the file:
$ sudo visudo
Note if you want to change the default editor use
$ sudo update-alternatives --config editor
Use the safe command sudo visudo to edit and check the syntax of the edits, otherwise if you directly edit and make a mistake you computer might not work.
%admin ALL=(ALL) NOPASSWD: ALL
Save and exit. Finally, you will also need to create the admin group:
and again, you need to be part of the admin group. So type this command in a shell:
# usermod -a -G admin <your username>
You should be able to use sudo without password.
To increase timeout for sudo
Defaults timestamp_timeout=1800 # increase the sudo timeout