To set the sudo password timeout value, use the passwd_timeout parameter. First, open the /etc/sudoers file with superuser privileges using sudo and visudo commands like so:
$ sudo visudo
Then add the following defaults entry, it implies that the sudo password prompt will time out after 20 minutes once sudo is invoked by a user.
Defaults env_reset,timestamp_timeout=20
Note: You can set whatever time you want in minutes and make sure to wait before it times out. You can also set time to 0 if you want a password prompt for every sudo commands you execute or disable password prompt forever by setting the value -1.
The defaults parameters have set in my /etc/sudoers file.
Save the file by pressing [Ctrl + O] and exit using [Ctrl + X]. Afterwards, test if the setting is working by running a command with sudo and wait for 2 minutes to see if the password prompt will time out.
