By default sudo remembers your password for 15 minutes. If you want to change that you can do so by
This opens an editor and points it to the sudoers file -- Ubuntu defaults to nano, other systems use Vi. You're now a super user editing one of the most important files on your system. No stress!
(Vi specific instructions noted with (vi!). Ignore these if you're using nano)
- Use the arrow keys to move to the end of the Defaults line.
(vi!) press the A (capital "a") key to move at the end of the current line and enter editing mode (append after the last character on the line).
- Now type
where X is the timeout expiration in minutes. If you specify 0 you will always be asked the password. If you specify a negative value, the timeout will never expire. E.g. Defaults env_reset,timestamp_timeout=5
(vi!) hit Escape to return to command mode. Now, if you're happy with your editing, type in :w <ENTER> to write the file and :q <ENTER> to exit vi. If you made a mistake, perhaps the easiest way is to redo from start, to exit without saving (hit Escape to enter the command mode) and then type :q! <ENTER>.
hit CTRL + X, then Y, then <ENTER> to save your file and exit nano.
You might want to read the sudoers and vi manual pages for additional information.